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