This article contains a list of notable mnemonics used to remember various objects, lists, etc.

Astronomy
Order of planets from the Sun: (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto)
obsolete (per the IAU definition of planet):
Most Vegetables Eat More Juice So Usually Never Pee
My Very Educated Mother Just Served Us Nine Potatoes
Many Vicious Elephants Met Just Slightly Under New Pineapples
My Very Easy Method Just Speeds Up Naming Planets
Mark's Very Extravagant Mother Just Sent Us Ninety Parakeets
Mother Very Eagerly Made A (Asteroids) Jelly Sandwich Under No ProtestStellar classification sequence: O B A F G K M R N SOh Be A Fine Girl/Guy, Kiss Me Right Now, Sweetheart!Revised stellar classification sequence: O B A F G K M L T YOld, Bald, And Fat Generals Kiss More Ladies Than YouSigns of the zodiac:Average distances of the outer planets from the Sun in astronomical units approximate nice round numbers:Jupiter: 5 AU,  Saturn: 10 AU,  Uranus: 20 AU,  Neptune: 30 AU,  Pluto: 40 AU

Biology
To remember the order of taxa in biology (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species, [Variety]):
"Dear King Philip Came Over For Good Soup" is often cited as a non-vulgar method for teaching students to memorize the taxonomic classification of system.  Other variations tend to start with the mythical king, with one author noting "The nonsense about King Philip, or some ribald version of it, has been memorized by generations of biology students".
Dear King Philip Claps Often For Good Science
Dark King Prawns Curl Over Fresh Green Salad
Do Kings Play Chess On Fine Green Silk?: 69 
Dumb Kids Prefer Cheese Over Fried Greasy Spinach: 69 
Do Kindly Place Cover On Fresh Green Spring Vegetables: 69 
Darn Kernel Panics Crash Our Family Game System
Do Keep Pond Clean Or Frog Gets Sick
Dumb Kids Play Catch Over Father's Grave Stone
Daniel Keeps Philip Cat On Friday Getting Salsa
To remember the processes that define living things:
MRS GREN: Movement; Respiration; Sensation; Growth; Reproduction; Excretion; Nutrition: 135 
To remember the number of humps on types of camels:: 67 D in Dromedary has one hump; B in Bactrian has twoTo recognize poison ivy
Leaves of three, leave it be.
COWS stand for Cold Opposite Warm Same, which are the relation between the components of the Caloric reflex test

Chemistry
To recall the names of the first 20 elements in the periodic table:Harry, he likes beer by cupfuls, not over frothy, never nasty mugs allowed. Since past six closing, are kegs cancelled?(H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca.)To remember the different charges of the anode and cathode in electrolysis (PANIC):Positive Anode Negative Is CathodeAN OIL RIG CAT:At the ANode, Oxidation Involves electron Loss.
Reduction Involves electron Gain at the CAThode.CHON: to remember the four most common elements in organismsCarbon, Hydrogen, Oxygen, NitrogenCHNOPS: to remember the six most common elements in organismsCarbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur

Engineering
For the EIA electronic color code, Black(0), Brown(1), Red(2), Orange(3), Yellow(4), Green(5), Blue(6), Violet(7), Gray(8), White(9), Gold(5%), Silver(10%), None(20%)
Big brown rabbits often yield great big vocal groans when gingerly slapped
Bad boys run our young girls behind victory garden walls
B .B Roy [of] Great Britain [has] Very Good Wife.A mnemonic to remember which way to turn common (right-hand thread) screws and nuts, including light bulbs, is "Righty-tighty, Lefty-loosey"; another is "Right on, Left off".: 165 
For the OSI Network Layer model Please Do Not Throw Sausage Pizza Away correspond to the Physical, Datalink, Network, Transport, Session, Presentation and Application layers.
For power in watts: Twinkle twinkle little star, Power equals I squared R.[1]

Geography
Both names of the northern major circles of latitude (the Arctic Circle and Tropic of Cancer) have six letters; both southern ones (the Antarctic Circle and Tropic of Capricorn) have nine.
The countries of South America in order of largest to smallest by area: Brazil, Argentina, Peru, Colombia, Bolivia, Venezuela, Chile, Paraguay, Ecuador, Guyana, Uruguay, SurinameBoring, Average Politics Can Become Very Corrupt. People Everywhere Get Used SometimesThe countries of Central America from North to South: Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, PanamaBig Gorillas Eat Hotdogs, Not Cold Pizza
Including Mexico, My Grandma's Bunny Eats Hamburgers, Not Canned PeasThe Great Lakes in order of largest to smallest: Superior, Huron, Michigan, Erie, OntarioSuper Heroes Must Eat OatsA more common mnemonic for the Great Lakes, disregarding order:Huron Ontario Michigan Erie Superior: HOMESThe principal factors affecting climate: LABDOWALatitude, Altitude, Build, Distance from the sea, Ocean currents, Wind, AspectThe countries bordering Germany (clockwise from top): Denmark, Poland, Czechia, Austria, Switzerland, France, Luxembourg, Belgium, Netherlands.
Do Polish Checks Always Say "France Look Back Now"!

Geology
Geological periods: Precambrian, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous; Post-Cretaceous Epochs: Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Recent (Holocene)Pregnant Camels Often Sit Down Carefully, Perhaps Their Joints Creak? Possibly Early Oiling Might Prevent Permanent Rheumatism: 62–63 
Paleozoic to Cenozoic: Pregnant Camels Ordinarily Sit Down Carefully, Perhaps Their Joints Creak
Post-Cretaceous Epochs: Please Eat Oats My Pretty Pet Horse (Holocene)Mohs scale of mineral hardness 1-10:For Talc(=1), Gypsum(=2), Calcite(=3), Fluorite(=4), Apatite(=5), Orthoclase(=6), Quartz(=7), Topaz(=8), Corundum(=9), Diamond(=10)
Tall Girls Can Fight And Other Queer Things Can Develop: 64 
TAll GYroscopes CAn FLy APart ORbiting QUickly TO COmplete DIsintegration: 64 
Toronto Girls Can Flirt And Only Quit To Chase Dwarves
Terrible Giants Can Find Alligators Or Quaint Trolls Conveniently Digestible
Tall Gene Calls Florence At Our Quarters To Correct DumbnessDifferentiating stalactites from stalagmites.The  'mites  go up and the  'tites  come down. When one has ants in one's pants, the mites go up and the tights come down.: 66  (In a strict scientific sense, a mite is not an ant, although "mite" in common speech can refer to any small creature.)
Stalactites hang tight, hang down like tights on a line; stalagmites might bite (if you sit on them), might reach the roof.: 66 
Tights hang from the Ceiling, and Mites crawl around on the Ground
You need might to do push-ups (from the floor). You must hold tight doing chin-ups (off the ceiling).
Stalactites are on the ceiling. Stalagmites are on the ground.: 66 
Stalactites cling tight to the ceiling; stalagmites might reach the ceiling.

History
Chinese dynasties (simplified): Xia (Hsia), Shang, Zhou (Chou), Qin (Ch'in), Han, Jin, Southern and Northern, Sui, Tang, Song, Yuan, Ming, Qing (Ching)She Shamefully Chose Chinese Hand Jingles (and) SiNfully Sweet Tango Songs: "You (and) Me, Chickadee!"English dynasties (simplified): Norman, Plantagenet, Lancaster, York, Tudor, Stuart, Hanover, WindsorNo Plan Like Yours To Study History Wisely.
Wives of Henry VIII (names): Aragon, Boleyn, Seymour, Cleves, Howard, ParrAll Boys Should Come Home Please: 103 Wives of Henry VIII (manner of death): Divorced, beheaded, died / Divorced, beheaded, survived.: 104 
British nobility rank order (simplified): Duke, Marquess, Earl, Viscount, BaronsDo Men Ever Visit Boston?Assassinated US presidents and perpetrators: Lincoln by Booth, Garfield by Guiteau, McKinley by Czolgosz and Kennedy by Oswald.Losers Bearing Grudges Grieve Mainly Cowards Killing Orators

Languages
Characteristic sequence of letters
I always comes before E (but after C, E comes before I)In most words like friend, field, piece, pierce, mischief, thief, tier, it is "i" which comes before "e". But on some words with c just before the pair of e and i, like receive, perceive,  "e" comes before "i". This can be remembered by the following mnemonic,

I before E, except after CBut this is not always obeyed as in case of weird and weigh, weight, height, neighbor etc. and can be remembered by extending that mnemonic as given below

I before E, except after C
Or when sounded "A" as in neighbor, weigh and weight
Or when sounded like "eye" as in height
And "weird" is just weirdAnother variant, which avoids confusion when the two letters represent different sounds instead of a single sound, as in atheist or being, runs

When it says ee
Put i before e
But not after cWhere ever there is a Q there is a U tooMost frequently u follows q. e.g.: Que, queen, question, quack, quark, quartz, quarry, quit, Pique, torque, macaque, exchequer. Hence the mnemonic:

Where ever there is a Q there is a U too (But this is violated by some words; see:List of English words containing Q not followed by U)

Letters of specific syllables in a word
BELIEVEDo not believe a lie.SECRETARYA secretary must keep a secretTEACHERThere is an ache in every teacher.MEASUREMENTBe sure of your measurements before you start work.FRIENDFri the end of your friendSPECIALThe CIA have special agentsBEAUTIFULBig Elephants Are UglySEPARATEAlways smell a rat when you spell separate
There was a farmer named Sep and one day his wife saw a rat. She yelled, “Sep! A rat – E!!!”CEMETERYThere are three "e"s buried in "cemetery".PRINCIPALThe principal is your pal.

Distinguishing between similar words
Difference between Advice & Advise, Practice & Practise, Licence & License etc.Advice, Practice, Licence etc. (those with c) are nouns and Advise, Practise, License etc. are verbs.

One way of remembering this is that the word ‘noun’ comes before the word ‘verb’ in the dictionary; likewise ‘c’ comes before ‘s’, so the nouns are ‘practice, licence, advice’ and the verbs are ‘practise, license, advise’.Here or HearWe hear with our ear.Complement and Complimentcomplement adds something to make it enough
compliment puts you in the limelightPrinciple and PrincipalYour principal is your pal
A rule can be called a principleRemedial and MenialRemedial work is meant to remedy.
Menial work is boring but it's mean (-ial) to complain.Their, There and They'reTheirs is not mine even though 'I' is in it.
There is where we'll be.
They're is a contraction of 'they are.'Stationary and stationeryStationery contains er and so does paper; stationary (not moving) contains ar and so does car
A for "at rest", e for envelopeGray and  greyGray is preferred in America while grey is preferred in England

First letter mnemonics of spelling
DIARRH(O)EADashing In A Rush, Running Harder (or) Else Accident!
Dining In A Rough Restaurant: Hurry, (otherwise)Expect Accidents!
Diarrhea Is A Really Runny Heap (of) Endless AmountsARITHMETICA Rat In The House May Eat The Ice CreamNECESSARYNot Every Cat Eats Sardines (Some Are Really Yummy)
Never Eat Chocolate, Eat Sardine Sandwiches And Remain YoungBECAUSEBig Elephants Can Always Understand Small Elephants
Big Elephants Cause Accidents  Under Small Elephants
Big Elephants Can't Always Use Small Exits
Big Elephants Can’t Always Use Small EntrancesMNEMONICSMnemonics Now Erase Man's Oldest Nemesis, Insufficient Cerebral StorageGEOGRAPHYGeorge's Elderly Old Grandfather Rode A Pig Home Yesterday.TOMORROWTrails Of My Old Red Rose Over WindowRHYTHMRhythm Helps Your Two Hips Move

Grammar
Adjective order in English: OSASCOMP (Opinion, Size, Age, Shape, Color, Origin, Material, Purpose)On Saturday And Sunday Cold Ovens Make Pastry
Commonly-used coordinating conjunctions in English: FANBOYSFor, And, Nor, But, Or, Yet, So
The verbs in French that use the auxiliary verb être in the compound past (sometimes called "verbs of motion") can be memorized using the phrase "Dr. (and) Mrs. Vandertramp":devenir, revenir, monter, rester, sortir, venir, aller, naître, descendre, entrer, rentrer, tomber, retourner, arriver, mourir, partir

Mathematics
Pi
The first 15 numbers of Pi can be remembered by counting the letters in the phrase, "How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics."

Quadratic equation
The articulation of the quadratic equation can be sung to the tune of various songs as a mnemonic device.

Mathematical operations
For helping students in remembering the rules in adding and multiplying two signed numbers, Balbuena and Buayan (2015) made the letter strategies LAUS (like signs, add; unlike signs, subtract) and LPUN (like signs, positive; unlike signs, negative), respectively.Order of Operations
PEMDAS
Please - Parenthesis
Excuse - Exponents
My - Multiplication
Dear - Division
Aunt - Addition
Sally - Subtraction
(In the UK, the phrase BIDMAS is used instead; Brackets, Indices, Division, Multiplication, Addition, Subtraction.)

Trigonometry
The mnemonic "SOHCAHTOA" (occasionally spelt "SOH CAH TOA") is often used to remember the basic trigonometric functions:
Sine = Opposite / Hypotenuse
Cosine = Adjacent / Hypotenuse
Tangent = Opposite / AdjacentOther mnemonics that have been used for this include:
Some Old Hippie
Caught Another Hippie
Tripping On Acid.
Ships Of Holland Call At Harwich To Obtain Apples.
Sighs Of Happiness Come After Having Tankards Of Ale.
Some Old Hen Caught Another Hen Taking Off Alone.
Silly Old Hitler Can't Advance His Troops On Africa.

Topology
Mnemonics for Euler's characteristic are "fav. me", for "F  add V, minus E ", and "veryfun".

Calculus
The mnemonic "LIATE" is commonly used to determine which functions are to be chosen as u and DV in integration by parts.

Logarithmic functions
Inverse trigonometric functions
Algebraic functions
Trigonometric functions
Exponential functions

Medicine
To remember the signs of a stroke:
FAST
Face (Has the victim's face fallen on one side?)
Arms (Can the victim raise both arms and keep them raised?)
Speech (Is the victim's speech slurred? Can they repeat a simple sentence?)
Time (It is time to contact emergency services.)
To remember the steps for Resuscitation:
D.R.S. A.B.C.D
Danger (Check for danger to yourself or others before starting)
Response (Check for signs of life or response)
Send for help (Call for backup, or Emergency services)
Airway (Check for obstruction in the throat)
Breaths (Check for breaths)
CPR (Commence CPR)
Defib (Apply Defibrillator)

Anatomy
To remember the 10 organ systems of the human body:NICER DRUMS (Nervous, Integumentary, Circulatory, Endocrine, Respiratory, Digestive, Reproductive, Urinary, Muscular, Skeletal)
Intrinsic muscles of hand'A OF A OF A'
Thenar  (lateral to medial-palmar surface):

Abductor pollicis brevis
    Opponens pollicis
    Flexor pollicis brevis
    Adductor pollicis

Hypothenar  (lateral to medial-palmar surface):

Opponens digiti minimi
    Flexor digiti minimi
    Abductor digiti minimi

Muscles of mandibular nerve (V3 of trigeminal nerve) : Mylohyoid, Tensor tympani + Tensor veli palatini, Digastric (Anterior) – 4 Muscles of Mastication (temporalis, masseter, medial and lateral pterygoidsMy Tensors Dig Ants for Mom
2 big ones, 2 small ones, 2 tensors, 2 pterygoidsBones of the wrist:Scaphoid bone, Lunate bone, Triquetral bone, Pisiform bone, Trapezium (bone), Trapezoid bone, Capitate bone & Hamate boneSome Lovers Try Positions That They Can't Handle
She Looks Too Pretty Try To Catch Her
So Long To Pinky, Here Comes The Thumb
Simply Learn The Positions That The Carpus Has
Send Louis To Paris To Tame Carnal Hungers
Stop Letting Those People Touch The Cadaver's HandsDifferential DiagnosisVINDICATECranial nerves

Music
Bowed strings
Mnemonics are used in remembering string names in violin standard tuning.
Good Dogs Always Eat
Greedy Dogs Always Eat
Mnemonics are used in remembering string names in viola standard tuning.
Cats Give Dogs Advice

Guitar
Mnemonics are used in remembering guitar string names in standard tuning.Every Average Dude Gets Better Eventually
Eggs Are Deliciously Good Breakfast Energy
Eddy Ate Dynamite Good  Bye Eddy
Every Adult Dog Growls Barks Eats.
Every Acid Dealer Gets Busted Eventually
Even After Dinner Giant Boys Eat
Elephants All Dine Generally Before Eight
Elephants And Donkeys Grow Big Ears
Every American Dog Gets Bones Easily
Every Angel Does Good Before Evil
Eat All Day Get Big Easy
Eine Alte Dame Geht Heute Einkaufen (German: an old lady goes shopping today)
Een Aap Die Geen Bananen Eet (Dutch: A monkey that doesn't eat bananas)Thus we get the names of the strings from 6th string to the 1st string in that order.
Conversely, a mnemonic listing the strings in the reverse order is:

Every Beginning Guitarist Does All Exercises!
Elvis' Big Great Dane Ate Everything
Every Big Girl Deserves An Elephant
Easter Bunny Gets Drunk At Easter
Easter Bunnies Go Dancing After Easter

Ukulele
As for guitar tuning, there is also a mnemonic for ukuleles. 

Good Cooks Eat A-lotIn the other direction it is Aunt Evy Cooks Grits

Reading music
Musicians can remember the notes associated with the five lines of the treble clef using any of the following mnemonics, EGBDF: (from the bottom line to the top) Every Good Boy Does Fine.
 Every Good Boy Deserves Fudge (or Friendship, Fun, Fruit, etc.)
Eggnog Gets Better During February
 Empty Garbage Before Dad FlipsThe four spaces of the treble clef spell out (from the bottom to the top) FACE and can be remembered as FACE fits in the space (between lines)
The five lines of the bass clef from the bottom to the top Good Boys Do Fine Always
 Good Birds Don't Fly Away
 Grizzly Bears Don't Fly Airplanes
 Great Basses Dig Fine Altos
 Goblins Bring Death For All
George Bush Didn't Find Anything
Good Burritos Don't Fall ApartThe four spaces of the bass clef from the bottom to the top All Cows Eat Grass
 All Cars Eat GasThe five lines of the alto clef from the bottom to the top Fat Alley Cat Eats GarbageThe four spaces of the alto clef from the bottom to the top Green Birds Do Fly
The order of sharps in key signature notation is F♯, C♯, G♯, D♯, A♯, E♯, B♯, which can be remembered using the phrase Father Charles Goes Down And Ends Battle
 Father Christmas Gave Dad An Electric Blanket.
 Fat Cats Go Down Alleys Eating Birds.
 Fidel Castro Gets Drunk And Eats Babies.
 Fat Cats Greedy Dogs All Eat Bananas.The order of flats is B♭, E♭, A♭, D♭, G♭, C♭, and F♭ (reverse order of sharps), which can be remembered using the phrase: Battle Ends And Down Goes Charles' Father
 Blanket Exploded And Dad Got Cold Feet.
 Before Eating A Doughnut Get Coffee First.To remember the difference between the whole rest and the half rest:
A whole rest looks like a "hole in the ground", and a half rest looks like a hat.

Philosophy
THE LAD ZAPPA is a mnemonic for the first 11 (and most important) Ionian philosophers: Thales, Heraclitus, Empedocles, Leucippus, Anaximander, Democritus, Zeno, Anaximenes, Protagoras, Parmenides, Anaxagoras .
THE PLAZA PAD is another mnemonic for the first 11 (and most important) Ionian philosophers: Thales, Heraclitus, Empedocles, Protagoras, Leucippus, Anaximander, Zeno, Anaximenes, Parmenides, Anaxagoras, Democritus.
SPA is a mnemonic for the philosophers Socrates, Plato, and Aristotle in their order of appearance, Socrates first.

Physics
Sequence of colors in a rainbow or visible spectrum (red, orange, yellow, green, blue, indigo, violet):"Richard Of York Gave Battle In Vain"
Roy G. Biv is also used as a fictitious name

Transportation
Marine"Red, Right, Return" reminds the skipper entering ("returning to") an IALA region B port to keep red markers to the starboard of the vessel.  Conversely the opposite convention exists in IALA region A ports, where a similar (but significantly different) mnemonic of "Red on the Right Returning To Sea" can be used.
The phrase "there's always some red port (wine) left" is used to remember the basics in seafaring. "Red" refers to the color of navigation lights on the port (left) side of a vessel (as opposed to green on the starboard side).
"Nuclear Restrictions Constrain Fishing and Sailing, People Say" is used to encode the "order of priority" for which vessels have right of way (earlier in the list has priority over later): Not under command; Restricted; Constrained by draft; Fishing vessel; Sailboat; Powerboat; Seaplane.

Aviation uses many mnemonics in addition to written checklists. See also Category: Aviation mnemonicsCRAFT - Clearance limit, Route, Altitude, Frequency, Transponder.
pre-landing: GUMPS - Gas, Undercarriage, Mixture, Propeller, Speed.
pre-final: MARTHA - Missed (procedure), Altitude (limit), Radios (set), Time (limit), Heading (final),  Airspeed (descent)
pre-high-altitude - FLOWER - Flow (enabled), Lights (test), Oxygen (charged), Water (humidity), Electricity (on), Radio (check)
pre-flight-paperwork - ARROW - Airworthiness (certificate), Registration, Required (charts), Operating (checklists), Weight and balance
night collision avoidance: Red, Right, Returning - Red nav light on Right implies target is Returning (closing)
radio loss Instrument course - CDEF - as Cleared, else Direct to last fix, else as directed to Expect, else as flight plan Filed
spin recovery - POKER - Power (off), Opposite (full rudder), Klean (flaps, ...), Elevator (briskly forward), Recover (from dive)

Units of measure
Common SI prefixes:kilo-, hecto-, deca-, deci-, centi-, milli-, in descending order of magnitude:"Base" (Meters, liters, grams) come in between "deca" and "deci".
Kangaroos Hop Down British Driveways Carrying M&Ms
King Henry Drank Both Diet Cokes Monday
King Henry Died By Drinking Chocolate Milkdeca-, hecto-, kilo-, mega-, giga-, tera-, in ascending order of magnitude:Decadent Hector Killed Meg's Gigantic Terrierdeci-,-, milli-, micro-, nano-, pico-, femto-, atto- in descending order of magnitude:Darn Clever Mnemonic Makes No Prefix Forgettable, Absolutely

See also
Mnemonic
List of firefighting mnemonics
List of visual mnemonics
Category: Science mnemonics

References
Further reading
Evans, Rod L. (2007). Every good boy deserves fudge : the book of mnemonic devices (1st ed.). New York, N.Y.: Perigee. ISBN 978-0-399-53351-8.
Parkinson, Judy (2008). I before E (except after C) : old-school ways to remember stuff. Pleasantville, N.Y.: Reader's Digest Association. ISBN 978-0-7621-0917-3.

External links
List of hundreds of mnemonics belonging to several topics
Medical mnemonics pdf (consisting of 22 pages full of) mnemonics on medical topics ordered alphabetically
Medical mnemonics
Searchable database of Medical mnemonics
Mnemonics generator for numbers
Collection of Mnemonics
Collection of Mnemonics by Category
Community website to collaborate and create new mnemonics