Jacket Type

Bullet jackets may be fabricated in a number of configurations:

Full metal jacket - encloses the entire bullet, with the exception of the base. Normally used for military purposes, these bullets are also known as full jacketed, full patch, full metal case, and ball ammunition.
Semijacketed – partially encloses the bullet with the exception of an exposed soft point or a hollow point.
Total metal jacket – fully encloses a bullet core.

Click the images below for a larger version:

Full metal jackets
Courtesy of Ronnie Freels