Unaspirated or tenuis consonants are occasionally marked with the modifier letter for unaspiration ⟨◌˭⟩, a superscript equal sign: <answer>⟨t˭⟩</answer>. Usually, however, unaspirated consonants are left unmarked: ⟨t⟩.
What is the superscript equal sign?
⟨t˭⟩