JKB and BGK, you're picking nits. Actually according to ANSI/ASME you are both wrong. NPT stands for "American National Standard Taper Threads"
Look up ANSI/ASME B1.20.1 specification and tell me what it says after "Basic Dimensions Of".
Enough of the nit picking. Will it matter in the grand scheme of things if someone calls NPT National Pipe Thread or National Pipe Taper? No. Both terms are understood to mean the same thing, although they are both not technically 100% correct.
You hit the correct mark with TAPER
edit: Not according to ANSI/ASME. It's Taper Threads Both words are used in the title of the link that I provided above.Don't really matter tho.
edit: You are correct. It doesn't matter if someone says National Pipe Taper or National Pipe Thread. Both terms are clear enough to know that the person is talking about the end of a pipe that is processed.
