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Virama

Virama (Sanskrit: विराम/हलन्त, romanizedvirāma/halanta ्, IPA: [ʋiraːmɐ, ɦɐlɐn̪t̪ɐ] (see #Names for other terms) is a Sanskrit phonological concept to suppress the inherent vowel that otherwise occurs with every consonant letter, commonly used as a generic term for a codepoint in Unicode, representing either

Unicode schemes of scripts writing Mainland Southeast Asia languages, such as that of Burmese script and of Tibetan script, generally do not group the two functions together.

The name is Sanskrit for "cessation, termination, end". As a Sanskrit word, it is used in place of several language-specific terms, such as:

In Devanagari and many other Indic scripts, a virama is used to cancel the inherent vowel of a consonant letter and represent a consonant without a vowel, a "dead" consonant. For example, in Devanagari,

If this k क् is further followed by another consonant letter, for example, ṣa ष, the result might look like क्‌ष, which represents kṣa as ka + (visible) virāma + ṣa. In this case, two elements k क् and ṣa ष are simply placed one by one, side by side. Alternatively, kṣa can be also written as a ligature क्ष, which is actually the preferred form. Generally, when a dead consonant letter C1 and another consonant letter C2 are conjoined, the result may be:

If the result is fully or half-conjoined, the (conceptual) virama which made C1 dead becomes invisible, logically existing only in a character encoding scheme such as ISCII or Unicode. If the result is not ligated, a virama is visible, attached to C1, actually written.

Basically, those differences are only glyph variants, and the three forms are semantically identical. Although there may be a preferred form for a given consonant cluster in each language and some scripts do not have some kind of ligatures or half forms at all, it is generally acceptable to use a nonligature form instead of a ligature form even when the latter is preferred if the font does not have a glyph for the ligature. In some other cases, whether to use a ligature or not is just a matter of taste.

The virāma in the sequence C1 + virāma + C2 may thus work as an invisible control character to ligate C1 and C2 in Unicode. For example,

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