Cyrillic Tsse (U+A690‥U+A691).

[jmcwilliams403]

• The requested characters are ...
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  • Cyrillic
  • Greek
  • Punctuation
  • Diacritic / Mark
  • Symbol
• The requested characters are used in ...
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This is the unvoiced version of Dzze (Ꚉ/ꚉ). Both are used in historic Abkhaz orthography.

Its form is derived from an upright Te with a miniature Es used as a descender

Its italic form is either unknown or not well documented online, as even the Unicode proposal doesn't show it — I even checked the sources it cites, but the only other images they provide in lieu of an italic/cursive form is that of a standalone Georgian letter used in an even older version of the Cyrillic orthography.

ꚈꚉꚐꚑ

Noto Sans Mono:

Fairfax HD (spaces added due to bad kerning):

Julia Mono (I wouldn't recommend following this form as it seems to be a misinterpretation of the Es shape as a reversed palatal hook):