Not Nepalese, Ceylonese (now Sri Lanka) - a very ornate form of the local billhook (or one of the local shapes) generally known as a "catte"... pronounced kattay - not sure of the spelling as currently in France and my archives are in the UK...
So a tool (CH serpe/gertel/hippe/heppe/haumesser), not a weapon....
In the Stone image above, nos 3 and 4 (possibly also no 5) look to be from Ceylon as well....
Just checked the web - one version called a Ran-kaetta- see:
http://books.google.fr/books?id=Nk8x...llhook&f=false
Also cattie, see:
http://www.scribd.com/doc/29997802/Old-Ceylon-1877
Also ketta, see:
http://www.jstor.org/pss/93135