See also:
U+0E5B, ๛
THAI CHARACTER KHOMUT
[unassigned: U+0E5C–U+0E80]

[U+0E5A]
Thai
[U+0E81]

Thai

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Thai Wikipedia has an article on:
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Punctuation mark

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  1. (archaic) the โคมูตร (koo-mûut), used to mark the end of a document.