Name for the Hollow point on the widest part of the blade?

[Joezilla]

Hey guys, Its been a while since I've been on any part of the forums for a while.
I've been researching my HI kukris, and others from the surrounding region. I know that Hollow concave cavity is important on the belly, is there a name for it? To me it kinda keeps a "kukri shaped knife" separate from a good balanced, very thick, kukri

 

[jdk1]

You mean a chirra?

 

[George Azar]

....or fuller?

This is what I googled.

These grooves are often called “blood grooves” or “blood gutters” as well as fullers, although their purpose has nothing to do with blood. A fuller is often used to lighten the blade, much the way that the shape of an I-beam allows a given amount of strength to be achieved with less material.

 

[ndoghouse]

I vote Fuller or Chirra as the Nepalis call it. I call them beautiful! Speakin of fullers!
Hey Bawanna I got me another Tin Chirra! Now I can use and abuse one of them and keep the other one pretty. Aunti Yangdu said it had some rust on it but Ill be dang if I could find it. I need another GCB now!