virama
A diacritic used in most writing systems of the Indian subcontinent to signify the lack of an inherent vowel.
a Devanagari example: क (ka) + ् = क् (k)
A sign which serves the same purpose in any writing system.
Where it comes from
Borrowed from Sanskrit विराम (virāma, “stop”).
Adapted from the Wiktionary entry virama (CC BY-SA 4.0).