they mean that they are numbers of or to pertaining to the numbers on the product. Identifiers.
what does it mean
Negative numbers means
Prime numbers are numbers with only two factors. Composite numbers are numbers with more than two factors.
If you mean larger by "the set of whole numbers strictly contains the set of natural numbers", then yes, but if you mean "the set of whole numbers has a larger cardinality (size) than the set of natural numbers", then no, they have the same size.
ruler could mean anything really ruler as in the one what you measure stuff with or a leader
2.5cm
by the numbers that are marked there
Stright edge
The numbers are to the left of the inch markers.
It is often called a straight-edge.
They both have numbers.
inches, centimeters and millimeters
A length of two units!
Ruler
It means a ruler or one ruler.
*mean