On grammatical class:

noi
non-restrictive relative clause; attaches subordinate bridi with incidental information.
poi
restrictive relative clause; attaches subordinate bridi with identifying information to a sumti.
voi
non-veridical restrictive clause used to form complicated le-like descriptions using "ke'a".

In definition:

ku'o
elidable terminator: end NOI relative clause; always elidable, but preferred in complex clauses.

In notes:

lo
veridical descriptor: the one(s) that really is(are) ...
ra'abri
x1 is a relative clause attached to argument x2 with predicate relation x3 among arguments x4.