NMR spectroscopists have always given techniques acronyms (eg: COSY, NOESY, EXSY, PENIS, EBURP, MQMAS ... etc). Find out what they all mean here:
Hmmmmmm....... I see that "PENIS" is not listed on the above website. It stands for Proton Enhanced Nuclear Induction Spectroscopy. For reasons of political correctness, it is now called "CP" (Cross Polarization).