210. The nasals n

The nasals n, ṇ, n̄, occurring as finals after a short vowel, are doubled before any initial vowel: thus, pratyán̄n̄ úd eṣi, udyánn ādityáḥ, āsánn-iṣu.

a. This is also to be regarded as a historical survival, the second nasal being an assimilation of an original consonant following the first. It is always written in the manuscripts, although the Vedic metre seems to show a duplication was sometimes omitted. The RV. has the compound vṛṣaṇaçva.