Arabic letter tah with two dots vertically below

In Pegon, it represents /ʈ/, a voiceless retroflex t.

Pegon adapts Arabic letter shapes to write Javanese sounds. This letter marks a t made with the tongue curled back, a sound standard Arabic does not need to distinguish. Its two vertical dots distinguish it from ordinary Arabic ṭāʾ, ط.

Pegon was used for Islamic teaching and translation for Javanese readers, and the broader tradition also appears in literature, letters, and notes.

How old is this letter?

The written form predates its Unicode encoding.

The proposal that documented this letter shows it in Pegon manuscript samples, including Cirebon material, and cites a Pegon manual from 1933, the earliest dated item it gives for this letter. That date is evidence of use by then, not a known invention date.

Pegon writers also used documented tah forms with one or three dots below for /ʈ/; the two-dot form is a less common manuscript variant.

Why does 𐻃 show as a box?

The font or app may lack the glyph or Arabic shaping support.

Fonts draw characters, and apps shape connected Arabic-script text. As of 2024, SIL's Scheherazade New and Lateef included this letter, but their release notes warned that some applications might not shape new Arabic letters correctly.

A box can therefore indicate a display limitation; it does not turn the letter into another character.