ᴑ U+1D11, ᴑ LATIN SMALL LETTER SIDEWAYS O ← ᴐ [U+1D10] Phonetic Extensions ᴒ → [U+1D12]

The character o rotated 90° anticlockwise. The Uralic Phonetic Alphabet makes regular use of 180°-rotation to denote a reduced form of a given sound; where this results in homoglyphy, as here, the character is rotated 90° anticlockwise instead.

ᴑ

1. (UPA) A reduced o vowel.
2. (superscript, UPA) an extremely short or fleeting ᴑ. [not supported by Unicode]

A reduced ö is fully turned ⟨o̤⟩.