The Vedic Extensions block spans U+1CD0–U+1CFF, 48 codepoints in Plane 0 (Basic Multilingual Plane). 43 are assigned in Unicode 16.0; the other 5 are reserved for future characters.
By script: Inherited (27), Common (16).
By general category: 27 non-spacing marks (Mn), 13 other letters (Lo), 2 spacing marks (Mc), 1 other punctuation (Po).
The first 35 arrived in Unicode 5.2 (2009); later additions came in 6.1 (4), 7.0 (2), 10.0 (1), 12.0 (1).
Most characters here are combining marks. See combining diacritical marks.