Prāt. 1.48. सावग्रहं पदमिङ्गयम् Com.on T.Pr. I.48.
इच् (l) short wording or pratyāhāra for vowels except अ. cf. इजोदश्च गुरुमतोSनृच्छः P.III.1.36; cf also VI. I.104, VI.3.68. VIII.4.31,32; (2) Samāsānta affix इ after Bahuvrīhi compounds showing a mutual ex- change of actions. e.g. केशाकेशि, दण्डादण्डि cf. इच् कर्मव्यतिहारे P.V.4. 127 also 128.
इञ् (l) kṛt. affix (इ), in the sense of verbal activity applied to any root, the word so formed being used in the fem. gender and in connection with narration or in interrogation; e.g. कां त्वं कारिमकार्षीः । सर्वौ कारिमकार्षम् । cf. Pāṇini III.3.110: (2) kṛt. affix in the sense of verbal activity applied to the roots वप् and others e.g. वापिः, वासि: etc. cf. P.III.3.108 Vārt. 7;(3) tad-affix इ in the sense of offspring applied to a noun ending in अ; e.g, दाक्षि: cf. P.IV.1. 95-7, 153.
इद् (l) augment इ prefixed,in general in the case of all roots barr- ing a few roots ending in vowels except ऊ and ऋ and roots शक्, पच्, etc., to such affixes of non-conjuga- tional tenses and moods as begin with any consonant except ह् and य्; cf. आर्धधातुकस्येड् वलादेः P.VII.2.35 to 78 and its exceptions P.VII.2.8 to 34; (2) personal ending of the third person sing. Ātm.
ण् (l) short wording or pratyāhāra for all vowels except अ and the consonants ह् ,य् ,व् , र्, ल् cf. इणः षः P.VIII.3.39,also P.VIII.3.57,78 (2) kṛt. affix इ applied to roots such as अज् अत् etc. in the sense of verbal activity.e.g आजिः,अतिः, आदि; cf.इणजादिभ्यः P. III.3,108, Vārt.6.
इत् (1) a letter or a group of letters attached to a word which is not
seen in actual use in the spoken language: cf अप्रयोगी इत्, Śāk. I.1.5, Hem.1.1.37. The इत् letters are applied to a word before it, or after it, and they have got each of them a purpose in grammar viz. causing or preventing certain grammatical operations in the formation of the complete word. Pāṇini has not given any defini- tion of the word इत् , but he has mentioned when and where the vowels and consonants attached to words are to be understood as इत्; (cf. उपदेशेजनुनासिक इत् , हलन्त्यम् । etc. P. I.3.2 to 8) and stated that these letters are to be dropped in actual use, cf.P.I.3.9. It appears that grammarians before Pāṇini had also employed such इत् letters, as is clear from some passages in the Mahābhāṣya as also from their use in other systems of grammar as also in the Uṇādi list of affixes, for purposes similar to those found served in Pāṇini 's grammar. Almost all vowels and consonants are used as इत् for different purposes and the इत् letters are applied to roots in the Dhā- tupāṭha, nouns in the Gaṇapāṭha, as also to affixes, augments and substitutes prescribed in grammar. Only at a few places they are attached to give facility of pronun- ciation. Sometimes the इत् letters, especially vowels, which are said to be इत्, when uttered as nasalized by Pāṇini, are recognised only by convention; cf. प्रतिज्ञानुनासिक्याः पाणि- नीयाः(S.K.on P.I.3.2).The word इत्, which literally means going away or disappearing, can be explained as a mute indicatory letter. In Pāṇini's grammar, the mute vowel अ applied to roots indicates the placing of the Ātmanepada affixes