3d

Short definition from Wiktionary

Adjective

1. 1
   Abbreviation of three-dimensional.
2. 2
   Obsolete form of 3rd.
3. 3
   Abbreviation of three-dimensional.

Noun

1. 1
   thruppence, threepence, a coin valuing three pennies
2. 2
   A system capable of recording or displaying three-dimensional video.
3. 3
   A three-dimensional video.