What do the following acronymns stand for 1.)P.S 2).C.C 3).B.C.C?

the last two are with reference to letters

What do the following acronymns stand for 1.)P.S 2).C.C 3).B.C.C?
PS : Post Scriptum (after writing in Latin)





CC : Carbon Copy





BCC : Blind Carbon Copy





This "Carbon" originally comes from this "era" when we where using carbons on typewriters :-)
Reply:1. P.S. is post script


2. C.C. is carbon copy


3. B.C.C is blind carbon copy