What 忹 means
It is a legacy Unicode code for the Han character 忹.
Taiwan’s CNS 11643 is a national character-encoding standard. Its 1992 edition recorded the form as T5-2438, a plane-5 code. Unicode kept the compatibility code so older text could be converted into Unicode and back without losing its original CNS code.
In a 2010 standards debate, Taiwanese contributors argued that 忹 and U+5FF9 could represent different Chinese characters, with different meanings or pronunciations. The editors moved the CNS source entry T5-2438 to U+5FF9 but retained 忹’s mapping to 忹. Taiwan’s CNS mapping notice dated 2025-01-13 lists U+5FF9 as the replacement for T5-2438. Normalization—software’s process for standardizing equivalent text—can turn 忹 into 忹; the sequence 忹︀ (U+5FF9 followed by U+FE00) preserves the glyph distinction.
Keep 忹 for an archived CNS code that must round-trip; use 忹 for ordinary Han text.
Normalization can replace 忹 with 忹 and erase the codepoint distinction.
Questions people ask
1Will every font show the special form?
No. Unicode defines the variation sequence, but only a font that supports it can display the distinct glyph.
How to type 忹
忹\2F89FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.