Billboarding with a single poly?

[AW999]

Billboards are described as a quad, but is it possible to use only a single poly if that's all that's needed for the particular shape of the billboard? Maybe I'm just looking in the wrong places or confused about the entire issue, but I haven't been able to find any information on this.

[EgonOlsen]

Anything can be a billboard, not just quads.