What ௬ means
It denotes the value six.
Tamil number notation took shape over time. Pottery from Alagankulam dated to the 1st or 2nd century CE and a Tondur cave inscription in Tamil-Brahmi, an early script for Tamil, assigned to about the 3rd century CE attest to the tradition, not this exact form.
A history of old writing records recognizable Tamil numerals by about 1400 CE. It connects their curves to older “Cave numerals” found in cave inscriptions and to palm-leaf writing. Inscriptions and manuscripts used them for arithmetic, land measurement, tax, weights, and volume. During the modern period, printing and international place-value digits pushed them into limited Tamil-studies use.
Don't confuse it with
4Questions people ask
1Why does ௬ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ௬
௬\0BECCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.