Combining Diacritical Marks Supplement
Combining Diacritical Marks Supplement is a Unicode block containing combining characters for the Uralic Phonetic Alphabet, Medievalist notations, and German dialectology (Teuthonista). It is an extension of the diacritic characters found in the Combining Diacritical Marks block.
Source: Wikipedia — Combining Diacritical Marks Supplement (CC BY-SA 4.0)