property number + unit a measured amount

wheel count

also called number of wheels

How many wheels a product runs on, as a numeral with the dimensionless 'wheel' count-unit — a static bin has none (the slot is omitted), a wheelie bin tilts and rolls on 2 wheels, a large container bin on 4. Modelled as a numeral count, not a token, because 2/4 are values of a count not structural categories. Optional: stated only when the product is wheeled. A general mobility property (a mop bucket or trolley may reuse it), not a bin-exclusive slot. Reuses WheelCountUnits. Concern measurement, axis-eligible (a 2-wheel vs 4-wheel bin is a genuine buy choice).

Wheel count is a measured figure.

It belongs to measurement — its measurable, physical facts.

asked by the kinds that answer it

2 kinds answer it, each for a single value. The same question can be reused by unrelated kinds — one meaning, many homes.

answered with: №number + unit — a number paired with a unit drawn from an exhaustive unit vocabulary.
value domain: Wheel-count units — the vocabulary its answers are drawn from.
concern: Measurement — the facet of a product it belongs to.

asked by kinds that answer it

The same question can be reused by unrelated kinds — one meaning, many homes.

kind	how many
waste bin	one
trolley	required · one