aḥ अः

Definition: visarga called visarjanīya in ancient works and shown in writing by two dots, one below the other, exactly of the same size, like the pair of breasts of a maiden as jocularly larly expressed by Durgasiṁha. cf. अः (:) इति विसर्जनीयः । अकार इह उच्चारणार्थः । कुमारीस्तनयुगाकृतिर्वर्णो विसजर्नीयसंज्ञो भवति (दुर्गसिंह on कातन्त्र I.1.16). विसर्ग is always a dependent letter included among the Ayogavāha letters and it is looked upon as a vowel when it forms a part of the preceding vowel; while it is looked upon as a consonant when it is changed into the Jihvāmūlīya or the Upadhmānīya letter.

Dictionary: Abhyankar
Literary Sources: