Old timers may be familiar with HTK (Hits TO Kill) being used instead of the now more standard HP (I'll use it now and again for no good reason). I've seen some posters online a little confused by HTK and if you collect vintage D&D/RPG you are going to see now and again and as above it is just another way to write Hit Points.
I got to thinking about it and realized it has a lot more certain definition built in as opposed to HP. HTK = take this much damage and death is the result, HP = there's this many points to fiddle with. HTK is a lot more certain and a tad more grim. Hmmm, I think like it more than ever before.