What is an appropriate name for a property that tells whether a list is empty, single or multiple?

Question

I have a property in programming which tells whether a list is empty, or has only one element or has more than one element. ( empty, single, multiple ).
I want to know what would be an appropriate name for the property that contains this value?
For example
{} -> empty
{"hi"} -> single / singular
{"hi", "bye"} -> multiple / plural

I want to know the name of the property that contains those values?

Edwin Ashworth · Answer

The nearest term you'll probably find is the hypernym cardinality.

cardinality [noun] [mathematics]
The number of elements in a set or other grouping, as a property of
that grouping.

[Lexico]
This takes values 0, 1, 2, 3 ... rather than 0, 1, many.

What is an appropriate name for a property that tells whether a list is empty, single or multiple?

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