Are surrogate characters the same as supplementary characters?
This question shows a common confusion. It is very important to distinguish surrogate code points (in the range U+D800..U+DFFF) from supplementary code points (in the completely different range, U+10000..U+10FFFF). Surrogate code points are reserved for use, in pairs, in representing supplementary code points in UTF-16. There are supplementary characters (i.e. encoded characters represented with a single supplementary code point), but there are not and will never be surrogate characters (i.e. encoded characters represented with a single surrogate code point).
