The Yasht (Yašts) are a collection of twenty-one hymns in Younger Avestan. Each of these hymns invokes a specific Zoroastrian divinity or concept. Yasht chapter and verse pointers are traditionally abbreviated as Yt. All the hymns of the Yasht collection "are written in what appears to be prose, but which, for a large part, may originally have been a (basically) eight-syllable verse, oscillating between four and thirteen syllables, and most often between seven and nine." The twenty-one yashts of the collection (notes follow): Notes: