3H (English, noun)
expansion: 3H (usually uncountable, plural 3Hs)
Senses:
glosses: A grade of pencil with lead that makes lighter marks than a pencil grade 2H but darker marks than a pencil of grade 4H; a pencil with hard lead.
tags: British
English
uncountable
usually
glosses: A pencil of grade 3H.
tags: uncountable
usually
glosses: tritium. In this case, the "3" should be superscripted: ³H.
tags: uncountable
usually
Forms:
form: 3Hs
tags: plural