IPA: /ˈbɪlˌbɔːrdɪŋ/
KK: /ˈbɪlˌbɔrdɪŋ/
A method used in 3D graphics where an image is displayed flat and faces the viewer, regardless of how the camera moves.
The game developers used billboarding to create realistic trees that always faced the player.
Billboarding is formed from "bill" (from Old French *billet*, meaning a written notice or advertisement) and "-boarding" (from the verb "board", meaning to put up or display). The term refers to the act of displaying advertisements on large boards.
Think of a 'bill' as a written notice that is 'put up' or 'displayed' on a board — that's what billboarding means.