see picture below
Butt - the rear of the handle of a knife.
Carbide - a mixture of carbon and a less electronegative element (iron, tungsten, boron, calcium...) that is a very hard material. It is often used in knife sharpeners and on knives that feature glass breakers.
Carbon Fiber - a handle type made with thin strands of carbon (thin as a human hair) woven into patterns, then set in resin.
Ceramic (Blade) - does not rust, so they are popular for use in scuba knives. This material is really, really hard so it almost never needs to be sharpened. It can be almost impossible to sharpen them, but as a trade off ceramic blades are often very brittle.
Chamfer - a beveled edge that connects two surfaces. This is often done a knife handle where two different materials meet.
Chisel (Grind) - see Single Bevel grind.
Choil - the area between the cutting edge and the tang of the knife. This is where your index finger would sit when you hold the knife open.
Clip Point (Blade) - see picture below
CPM 10V (Steel) - one of the most wear resistant tool steels. It also has decent toughness for a tool steel. This is a great choice if you are looking for something with lots of wear resistance, but is not a really tough material.
CPM 154 (Steel) - contains 1.05% carbon. The CPM manufacturing process makes this steel different than Crucibleâ€™s standard 154-CM; the carbides are distributed evenly throughout the steel, which makes it tougher than 154-CM. CPM-154 also has good edge retention.
CPM 3V (Steel) - designed to be tough while also being a high wear resistance steel. For the most part it succeeds.
CPM M4 (Steel) - has excellent wear resistance and toughness. Has about 1.42% carbon.
Cocobolo - a type of tropical hardwood that is often used in handle scales. It is often orange, or reddish-brown in color.
Cordura速 - a fabric that is often used on backpacks and sheaths. It is even used on apparel. It is very durable and doesn't tear easily.
CTS-BD1 (steel) - is a Carpenter Steel. This steel is unique because it is melted in a vacuum. Spyderco is currently experimenting with this steel. Contains: 0.9% Carbon; 15.75% Chromium; 0.6% Manganese; 0.3% Molybdenum; 0.37% Silicon; 0.1% Vanadium.
CTS-BD30P (steel) - is a Carpenter Steel. This is very similar to that of the S30V. Contains: 1.5% Carbon; 0.9% Cobalt; 14% Chromium; 0.9% Manganese; 0.5% Molybdenum; 0.25% Nitrogen; 0.4% Silicon; 0.2% Tungsten; 4% Vanadium.
Cutting Edge - the sharpened edge of the blade.
D2 (Steel) - much tougher than most stainless steels, but not as tough as most of the other tool steels. This steel does have excellent wear resistance. It has great edge retention but can be very difficult to sharpen. This is also a tough material to mirror polish, so it you will almost never see it that way. Its carbon content is 1.50-1.60%.
Dagger (Blade) - see picture below
Damascus (Steel) - there are some reports that when the first Damascus steel was encountered it would cut through the sword blades that the Europeans were using. This is reportedly because the material was the perfect mixture of tough steel and hard steel. In the Middle East this type of steel had been made for thousands of years, but the knowledge of how to work this metal was lost at some point. Consequently, the type of Damascus made today is not produced the same way that it was made anciently. Today, pattern welded steel is made to reproduce the look of ancient Damascus steel. This type of steel is made by taking two (or more) layers of different types of steel and folding them together. As an example of how this might work, think of Play-doh that you played with when you were a kid. If you were to take two different pieces of Play-doh and fold them together over and over again, you have an idea of how this type of steel is made. After the two different steels are folded
together, the steel is acid etched. The color contrast and patterns on the blade comes from the fact that the two types of steel etch differently. Damascus steel is considered a precious metal, because it is difficult to make, and can result 