zi'a'o VUhU experimental cmavo

mathematical operator: the empty/null [one sense]/trivial [one sense]/blank operator

Arity is context-dependent. Induced structure is /probably/ empty/trivial [one sense] as well.

In notes:

gu'ai (exp!)
binary operator: left group action g.x
ma'o'e (exp!)
mathematical operator: vague/elliptical/general/generic operator
ru'ei (exp!)
n-ary operator: n-ary magma/group/ring operator a*b = ab`
terbri editor: passes the terbri value through the quoted function so that the sumti that fills it really is filling the output of the function