Jacketed Hollow Point
Also: JHP
A jacketed bullet with an open cavity at the nose, designed to expand on impact. The jacket controls expansion and protects the bore.
A jacketed hollow point wraps a lead core in a metal jacket but leaves a cavity at the tip. On impact the cavity drives expansion outward, the jacket peels back in a controlled mushroom, and the bullet dumps its energy into the target instead of zipping straight through. That makes it the standard for defensive and many hunting loads.
Do not confuse the hunting style with a match hollow point. On a target bullet the small tip opening is a byproduct of forming the jacket for aerodynamics, not a mechanism for expansion. Same two words, opposite design intent.