What means
It named a boat part in older dictionaries. The Kangxi Dictionary, a large Qing-era Chinese reference work, quotes the Yupian dictionary glossing 欆 as a boat oar; it cites the Jiyun dictionary for 栙欆, a sail not yet raised.
Questions people ask
1Why does 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
𮲮\2ECAECodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
