U+1D7F Latin Small Letter Upsilon with Stroke

The Wikipedia has the following information about this codepoint:

The close central rounded vowel, or high central rounded vowel, is a type of vowel sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ʉ⟩, and the equivalent X-SAMPA symbol is }. The sound is also commonly referred to by the name of its symbol, "barred u".

The close central rounded vowel is the vocalic equivalent of the rare labialized post-palatal approximant [ẅ].

In most languages this rounded vowel is pronounced with protruded lips (endolabial). However, in a few cases the lips are compressed (exolabial).

Some languages feature the near-close central rounded vowel (), which is slightly lower. It is most often transcribed in IPA with ⟨ʉ̞⟩, ⟨ʊ̈⟩ and ⟨ʊ̟⟩, but ⟨ɵ̝⟩ is also a possible transcription. The symbol ⟨ᵿ⟩, a conflation of ⟨ʊ⟩ and ⟨ʉ⟩, is used as an unofficial extension of the IPA to represent this sound by a number of publications, such as Accents of English by John C. Wells. In the third edition of the Oxford English Dictionary, ⟨ᵿ⟩ represents free variation between /ʊ/ and /ə/.