Heterogram (literature)

A heterogram (from "hetero-", meaning 'different', + "-gram", meaning 'written') is a word, phrase, or sentence in which no letter of the alphabet occurs more than once. The terms isogram and nonpattern word have also been used to mean the same thing. 
It is not clear who coined or popularized the term "heterogram". The concept appears in Dmitri Borgmann's 1965 book, ' but he uses the term "isogram". In a 1985 article, Borgmann claims to have "launched" the term "isogram" then. He also suggests an alternative term, asogram"', to avoid confusion with lines of constant value such as contour lines, but uses "isogram" in the article itself.
"Isogram" has also been used to mean a string where each letter present is used the same number of times. Multiple terms have been used to describe words where each letter used appears a certain number of times. For example, a word where every featured letter appears twice, like "appeases", might be called a "pair isogram", a "second-order isogram", or a "2-isogram".
A perfect pangram is an example of a heterogram, with the added restriction that it uses all the letters of the alphabet.
Uses in ciphers.
Heterograms can be useful as keys in ciphers, since heterogram sequences of the same length make for simple one-to-one mapping between the symbols. Ten-letter heterograms like PATHFINDER, DUMBWAITER, and BLACKHORSE are commonly used by salespeople of products where the retail price is typically negotiated, such as used cars, jewelry, or antiques. 
For example, using the PATHFINDER cipher, P represents 1, A represents 2 and so on. The price tag for an item selling for $1200 may also bear the cryptic letters FRR, written on the back or bottom of the tag. A salesman familiar with the PATHFINDER cipher will know that the original cost of the item was $500, so that if the price is negotiated he will not accidentally eliminate all of the 140% margin in the $1200 price shown to prospective buyers.
A twelve-letter cipher could be used to indicate months of the year.
Longest examples.
In the book "", Dmitri Borgmann tries to find the longest such word. The longest one he found was "dermatoglyphics" at 15 letters. He coins several longer hypothetical words, such as "thumbscrew-japingly" (18 letters, defined as "as if mocking a thumbscrew") and, with the "uttermost limit in the way of verbal creativeness", "pubvexingfjord-schmaltzy" (23 letters, defined as "as if in the manner of the extreme sentimentalism generated in some individuals by the sight of a majestic fjord, which sentimentalism is annoying to the clientele of an English inn").
In the book "Making the Alphabet Dance", Ross Eckler reports the word "subdermatoglyphic" (17 letters) can be found in an article by Lowell Goldmith called "Chaos: To See a World in a Grain of Sand and a Heaven in a Wild Flower". He also found the name "Melvin Schwarzkopf" (17 letters), a man living in Alton, Illinois, and proposed the name "Emily Jung Schwartzkopf" (21 letters). In an elaborate story, Eckler talked about a group of scientists who name the unavoidable urge to speak in pangrams the "Hjelmqvist-Gryb-Zock-Pfund-Wax syndrome".
The longest German heterogram is "Heizölrückstoßabdämpfung" (heating oil recoil dampening) which uses 24 of the 30 letters in the German alphabet. It is closely followed by "Boxkampfjuryschützlinge" (box fight jury fosterlings) and "Zwölftonmusikbücherjagd" (twelve-tone music book chase) with 23 letters. The longest Dutch heterogram is "Exvakbondsjuryzwijgplicht" (former union jury oath of secrecy) with 24 of the 27 Dutch letters.
Other examples.
Words.
12 letters.
There are hundreds of eleven-letter isograms, over one thousand ten-letter isograms and thousands of such nine-letter words. 