I agree with Ariel, it's definitely interesting that we have a few odd names (categories) that have survived to today, yet no native terms to distinguish straight and curved katars, even though arguably one of the most basic variations you could make to a katar (blade-wise) is to give it a curved blade.
For reference purposes, the surviving, clearly defined terms I've found are:
Bara Jamdadu - a "hooded" katar
Pattani Jamdadu - a katar with a long, straight (pata-style) blade
Jamdhar Sehlicaneh - a katar with a three pointed blade
Jamdhar Doulicaneh - a katar with a two pointed blade
All of these are recorded by Egerton, along with a number of other weird terms,
however the ones listed above are the only ones with clear definitions that seem to have lasted, being reproduced by numerous publications since.
Just some observations.
