The Śiva·sūtras, technically akṣara·samāmnāya, variously called , pratyāhāra·sūtrāṇi, varṇa·samāmnāya, etc., refer to a set of fourteen aphorisms devised as an arrangement of the sounds of Sanskrit for the purposes of grammatical exposition as carried out by the grammarian Pāṇini in the Aṣṭādhyāyī. Pāṇini himself uses the term akṣara·samāmnāya whereas the colloquial term "Shiva sutra" is a later development, as per claims by Nandikeśvara in his Kāśikā, that the god Śiva sounded his drum fourteen times to reveal these sounds to Pāṇini. They were either composed by Pāṇini to accompany his or predate him. Text and notation a i u Ṇ ṛ ḷ K e o Ṅ ai au C ha ya va ra Ṭ la Ṇ ña ma ṅa ṇa na M jha bha Ñ gha ḍha dha Ṣ ja ba ga ḍa da Ś kha pha cha ṭha tha ca ṭa ta V ka pa Y śa ṣa sa R ha L Each verse consists of a group of basic Sanskrit phonemes (i.e. open syllables consisting either of initial vowels or consonants followed by the basic vowel "a") followed by a single 'dummy letter', or anubandha, conventionally rendered in upper case and named '' by Pāṇini. Scheme This allows Pāṇini to refer to groups of phonemes with , which consist of a phoneme-letter and an anubandha (and often the vowel a to aid pronunciation) and signify all of the intervening phonemes. Pratyāhāras are thus single syllables, but they can be declined (see Aṣṭādhyāyī 6.1.77 below). Hence the pratyāhāra aL refers to all phonemes (because it consists of the first phoneme of the first verse (a) and the last anubandha of the last verse (L)); aC refers to vowels (i.e., all of the phonemes before the anubandha C: i.e. a i u ṛ ḷ e o ai au); haL to consonants, and so on. Issues Note that some pratyāhāras are ambiguous. The anubandha Ṇ occurs twice in the list, which means that you can assign two different meanings to pratyāhāra aṆ (including or excluding ṛ, etc.); in fact, both of these meanings are used in the Aṣṭādhyāyī. On the other hand, the pratyāhāra haL is always used in the meaning "all consonants"—Pāṇini never uses pratyāhāras to refer to sets consisting of a single phoneme. Combinations From these 14 verses, a total of 280 pratyāhāras can be formed: 14*3 + 13*2 + 12*2 + 11*2 + 10*4 + 9*1 + 8*5