PTS Pali-English dictionary - The Pali Text Society's Pali-English dictionary
Kappu
Kappu,(nt.)=kappa in the dialect used by Makkhali Gosāla,presumably the dialect of Vesāli,D.I,54; DA.I,164 (a Burmeṣe MS.reads kappi,and so do Pv IV.332; PvA.254).(Page 188)