The Sanskrit consonants, called vyañjana (व्यञ्जन), are arranged in a famously systematic grid that mirrors the anatomy of the human mouth. Thirty-three consonants are taught in classical grammar, grouped into five rows of stops, four semivowels, three sibilants, and the aspirate h.
The Five Vargas
A varga is a row of five consonants sharing the same place of articulation. Within each row the order is fixed: voiceless unaspirated, voiceless aspirated, voiced unaspirated, voiced aspirated, and nasal.
- Ka-varga (velar): क (ka) ख (kha) ग (ga) घ (gha) ङ (ṅa)
- Cha-varga (palatal): च (ca) छ (cha) ज (ja) झ (jha) ञ (ña)
- Ta-varga (retroflex): ट (ṭa) ठ (ṭha) ड (ḍa) ढ (ḍha) ण (ṇa)
- Ta-varga (dental): त (ta) थ (tha) द (da) ध (dha) न (na)
- Pa-varga (labial): प (pa) फ (pha) ब (ba) भ (bha) म (ma)
The grid is more than a memory aid. It records a scientific theory of how speech sounds are produced: by closing the airstream at five points — soft palate, hard palate, tip of the tongue against the roof, tip of the tongue against the teeth, and lips.
The Semivowels ()
Four sounds bridge vowels and consonants and are called antastha (अन्तःस्थ, "in between"):
- य (ya) — palatal
- र (ra) — retroflex
- ल (la) — dental
- व (va) — labial
Notice that each semivowel shares its place with a corresponding vowel: y with i, r with ṛ, l with ḷ, v with u. This relationship explains many regular alternations in Sanskrit, where a vowel becomes its corresponding semivowel before another vowel.
The Sibilants ()
Three sibilants and the aspirate h are called ūṣman (ऊष्मन्, "heated") because their pronunciation involves continuous breath:
- श (śa) — palatal
- ष (ṣa) — retroflex
- स (sa) — dental
- ह (ha) — glottal
Distinguishing the three sibilants is crucial. The word शास्त्र (śāstra, "treatise") begins with palatal śa, while षट् (ṣaṭ, "six") begins with retroflex ṣa. Confusing them changes the word.
Aspiration and Voicing
Sanskrit is unusual among major world languages in distinguishing aspirated from unaspirated consonants as separate phonemes. Kara (कर, "hand") and khara (खर, "donkey") differ only by a puff of breath. Likewise, voiced and voiceless versions are kept apart: ग (ga) and क (ka), ज (ja) and च (ca).
The Place Categories
The traditional five places are:
- Kaṇṭhya (throat / velar)
- Tālavya (palate / palatal)
- Mūrdhanya (roof of mouth / retroflex)
- Dantya (teeth / dental)
- Oṣṭhya (lips / labial)
These categories determine sandhi and inform the design of mantras, where the position of sounds in the mouth is considered spiritually significant.
The consonantal grid is the foundation of Sanskrit's phonetic exactness — a system in which every sound has its place and every place has its sound.