Cannon

From FEInfobase

Often confused as the correct spelling of canon (as in Star Trek Canon), the [dictionary.com] meaning of the word cannon is shown below.

cannon (Pronounced kanen)

• A large mounted weapon that fires heavy projectiles. Cannon include guns, howitzers, and mortars.
• The loop at the top of a bell by which it is hung.
• A round bit for a horse.
• Zoology. The section of the lower leg in some hoofed mammals between the hock or knee and the fetlock, containing the cannon bone.
• Chiefly British. A carom made in billiards.