The Supplemental Arrows-C block spans U+1F800–U+1F8FF, 256 codepoints in Plane 1 (Supplementary Multilingual Plane). 162 are assigned in Unicode 16.0; the other 94 are reserved for future characters.
All of its characters have the script value Common: they are shared across writing systems rather than tied to one.
By general category: 162 other symbols (So).
The first 148 arrived in Unicode 7.0 (2014); later additions came in 13.0 (2), 16.0 (12).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.