LATIN SMALL LETTER O WITH HOOK ABOVE

Ở latin capital letter o with horn and hook above (U+1EDE) @ Graphemica

ScriptSource - Entry - Phonetic Symbol Guide

Ỏ - LATIN CAPITAL LETTER O WITH HOOK ABOVE (U+1ECE)

Writing Greek Letters on the Computer

Latin Symbols Copy and Paste Ḁ ḁ Ḃ ḃ Ḅ ḅ Ḇ ḇ Ḉ ḉ

ổ, latin small letter o with circumflex and hook above

Charbase U+01EB: LATIN SMALL LETTER O WITH OGONEK

ScriptSource - Entry - Phonetic Symbol Guide

File:Latin letter A with ring above and ogonek.svg - Wikimedia Commons

Letter Database

Latin Extended Additional characters supported by the Times New Roman Bold Italic font

O - Wiktionary, the free dictionary