Horn

The horn diacritic (or dấu móc) is only used in the Vietnamese Quốc Ngữ orthography, where it is used for discerning different vowel qualities.

Horn in Unicode

Precomposed Letters with Horn
◌̛	Ơ	ơ	Ớ	ớ	Ờ	ờ	Ở	ở	Ỡ	ỡ	Ợ	ợ
U+031B	U+01A0	U+01A1	U+1EDA	U+1EDB	U+1EDC	U+1EDD	U+1EDE	U+1EDF	U+1EE0	U+1EE1	U+1EE2	U+1EE3
Combining Horn	Latin Capital Letter O With Horn	Latin Small Letter O With Horn	Latin Capital Letter O With Horn And Acute	Latin Small Letter O With Horn And Acute	Latin Capital Letter O With Horn And Grave	Latin Small Letter O With Horn And Grave	Latin Capital Letter O With Horn And Hook Above	Latin Small Letter O With Horn And Hook Above	Latin Capital Letter O With Horn And Tilde	Latin Small Letter O With Horn And Tilde	Latin Capital Letter O With Horn And Dot Below	Latin Small Letter O With Horn And Dot Below
Ư	ư	Ứ	ứ	Ừ	ừ	Ử	ử	Ữ	ữ	Ự	ự
U+01AF	U+01B0	U+1EE8	U+1EE9	U+1EEA	U+1EEB	U+1EEC	U+1EED	U+1EEE	U+1EEF	U+1EF0	U+1EF1
Latin Capital Letter U With Horn	Latin Small Letter U With Horn	Latin Capital Letter U With Horn And Acute	Latin Small Letter U With Horn And Acute	Latin Capital Letter U With Horn And Grave	Latin Small Letter U With Horn And Grave	Latin Capital Letter U With Horn And Hook Above	Latin Small Letter U With Horn And Hook Above	Latin Capital Letter U With Horn And Tilde	Latin Small Letter U With Horn And Tilde	Latin Capital Letter U With Horn And Dot Below	Latin Small Letter U With Horn And Dot Below

Uses of Horn
Usage	Language	Letters	Notes
Unrounded central vowel	Vietnamese	Ơơ /əː˧/, Ớớ /əː˧˥/, Ờờ /ə̤ː˨˩/, Ởở /əː˧˩˧/, Ỡỡ /əˀː˧˥/, Ợợ /ə̰ːʔ˨˩/, Ưư /ɨ˧/, Ứứ /ɨ˧˥/, Ừừ /ɨ̤˨˩/, Ửử /ɨ˧˩˧/, Ữữ /ɨˀ˧˥/, Ựự /ɨ̰ʔ˨˩/