Unaspirated or tenuis consonants are occasionally marked with the modifier letter for unaspiration ⟨◌˭⟩, a superscript equal sign: ⟨t˭⟩. Usually, however, unaspirated consonants are left unmarked: ⟨t⟩.
What is occasionally marked with the modifier letter for aspiration?
{'text': 'Unaspirated or tenuis consonants', 'answer_start': 0}