number/quantity: nif, thirty-six, six squared.
«nif» is a term used by jan Misali, see seximal.net/words for reference. See also xa, te'a, re, reltefpi'i, kurtenfa. Can also be expressed as «xapi'ixa» (six times six) or «sopi'ivo» (nine times four) or «gaipi'ici» (twelve times three).