In team line-outs or other lists of names in printed media, referring to players' christian names only by the initial letter.
For example a back seven in a TFK hurling team would look something like:
K. Passion, C. Mice, D. Red Anus, F. O'Dowd, P. Hussain, G. Man, P. Misanthrope.
In commentary, referring to players by their full names. This tradition was designed to differentiate GAA commentary from pretty much all other sports, but primarily to differentiate it from association football.