Soyombo Gemination Mark

It marks one consonant as doubled inside a Soyombo syllable.

Soyombo was devised in 1686 by Zanabazar, a Mongolian Buddhist leader. It was used for Mongolian, Sanskrit, and Tibetan writing, mainly in Buddhist manuscripts and inscriptions across Central Asia.

Soyombo’s letterforms belong to the Indic, or Brahmic, script tradition—a family of writing systems that developed in South Asia—and draw in part on Devanagari. Manuscript forms are compared with Tibetan, Ranjana (a script from Nepal), and Zanabazar Square, the separate script Zanabazar also devised for the same three languages.

Where does the mark go in text?

Type it immediately after the base consonant.

The stored order and visible position differ: shaping places the mark above the triangle at the top of the consonant’s frame. Put it before other combining marks; above-base signs are drawn higher. In 𑩜𑪘, the Soyombo ka is followed by this mark.

The separate Soyombo subjoiner 𑪙 builds consonant stacks; it does not stand in for gemination. A font without Soyombo support may show this mark as a box or detached sign. A dotted circle in a chart is a placement aid, not part of the text.