CJK ideograph 𪷎

No recorded meaning — the standards keep the character but give it no gloss. 𪷎 sits in Extension C, Unicode's block of rare and historical hanzi. It entered the standard through a Korean hanja character set — source K5-0139, a collection of characters needed for Korean use — and Taiwan's national standard CNS11643 lists it too, under a provisional code. What those records supply is a reading and a structure, not a definition.

Its make-up follows the usual hanzi recipe: the left-hand 氵 is the water radical, marking the broad area of sense, and the right-hand 貳 appears to supply the sound. 貳 is the elaborate "two" written on cheques and legal sums to make the figure hard to alter, and it is read èr — the very reading the records give 𪷎. If it once named something water-related, the surviving records do not say what.

So if you meet it inside a text, treat it as a rare or obsolete form and keep it exactly as written — do not substitute 二, which is a different character.

Why does 𪷎 show up as an empty box?

Some fonts simply don't contain it — coverage varies by system. 𪷎 lives on the Supplementary Ideographic Plane, the second plane of hanzi above the basic set, inside Extension C — a block of rare characters added in Unicode 5.2. On a system whose fonts lack it, a hollow box or a question-mark tile appears in its place; on others it displays normally — Windows has included it in a default font since Windows 10.

So if a document, a name or a message shows you a square where a character should be, a rare character like this may be the explanation: real, encoded and perfectly valid — just missing from the font.

Should you ever write 𪷎 yourself?

Rarely — write 二, or 貳 on a cheque. Sharing the sound èr does not make 𪷎 a numeral: no reference lists it as a way to write "two", and on systems without a covering font it shows as a box anyway. Its place is in transcribing a source that contains it, and in talk about the character itself.