For the most part, IAST is a subset of ISO 15919 that merges: the retroflex (underdotted) liquids with the vocalic ones (ringed below); and the short close-mid vowels with the long ones. The following seven exceptions are from the ISO standard accommodating an extended repertoire of symbols to allow transliteration of Devanāgarī and other Indic scripts, as used for languages other than Sanskrit.