Basic Latin

Basic Latin is a Unicode Block containing Basic Latin (hence the name) letters, come C0 and C1 controls and symbols used for numerous nationalities.

It is also the first Unicode Block being the Basic Multilingual plane, It's old Unicode name was ASCII. The first Unicode character in this block is Null, the last is Delete. See also: The Wikipedia Article

Other
All controls in Basic Latin are C0 controls, for C1 controls, see Latin-1 Supplement