϶

Etymology
Reversed (or backwards) version of the lowercase lunate epsilon ϵ. Introduced by Giuseppe Peano in 1889 in "Principles of arithmetic, presented by a new method".

Symbol

 * 1)  "such that"
 * 2)  A graphic variant of ⟨ɜ⟩.

User notes
The Teuthonista central rounded vowels, from high/close to near-open, are:
 * ʉ ꭏ ɵ ϶ ꭂ