Zero-ness

Hi, another quick question... (I only do linguistics as a hobby, so please
bear with my lack of knowledge) :-)

I'm making a conlang where the nouns have three "numbers": singular,
plural and a third number that indicates the absence or negation of a
noun. Right now, the only term I can think of to represent this is
"zero"... any better suggestions?

"Plural nouns" and "singular nouns" are easily understood, but "zero
nouns" may be misread to mean no nouns, instead of a noun in its zero
number... so I need a better term! Suggestions will be appreciated!


T