4B
(initialism) . (British) A grade of pencil with lead that makes darker marks than a pencil grade 3B but lighter marks than a pencil of grade 5B; a pencil with very soft lead.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.