what is a gross?

A gross is a dozen dozen ... or in other words, 12 x 12.

=)

One Gross is a measurement equal to 144 of something (a dozen dozen). The term is not often used today.

To calculate a gross, you simply multiply the number of dozens by 12. For example, if you have 2 dozens, you would multiply 2 by 12 to get a gross of 24.