I have silly pet peeves with certain nicknames. It bothers me when a group with a Phi chooses a nickname with a P to replace the Phi. Phi doesn't make a "p" sound, Pi does. Same with Theta. Theta makes a "th" sound not a "t" sound, Tau makes a "t" sound. So of course, "TPA" causes me much cognitive dissonance.
I also hate when people say/write EK, EN, EX, etc. Sigmas are not Epsilons, and it's not that hard to write/draw Sigmas.