deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
gbH stands for "/guNa before hard".
When I write "by gbH", I mean "by hardsoft" or "by pugantalagh...".
I only do that when the next affix is hard and /pit.
See also gbS.
Why don't you just write "by hardsoft" or "by pugantalagh..."?
Because I'm lazy. Also because I like to remind you that the affix is hard and /pit.