What is a number 2 pencil? Here are some definitions.
Noun
(US) A pencil which produces a specific shade of dark gray. One can usually identify a number 2 pencil by looking for the number "2" conspicuouslyemblazoned on the pencil. Often required for test-taking and the completion of official forms.
(US) A standard, ordinary pencil; one which is not colored or mechanical or in any other way unusual.