U+FE4C DOUBLE WAVY OVERLINE

U+FE4C was added to Unicode in version 1.1 (1993). It belongs to the block CJK Compatibility Forms in the Basic Multilingual Plane.

This character is a Other Punctuation and is commonly used, that is, in no specific script.

The glyph is a Compat composition of the glyphs . It has a Wide East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. The glyph can, under circumstances, be confused with 10 other glyphs. In text U+FE4C behaves as Ideographic regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In mathematical notation, an overline has been used for a long time as a vinculum, a way of showing that certain symbols belong together. Other uses are to indicate Roman numerals multiplied by a thousand and in forming medieval abbreviations (sigla). Marking one or more words with a continuous line above the characters is sometimes called "overstriking", though overstriking generally refers to printing one character on top of an already-printed character.

An overline, that is, a single line above a chunk of text, should not be confused with the macron, a diacritical mark placed above (or sometimes below) individual letters. The macron is narrower than the character box. Since ISO and Unicode Consortium assign names to characters in their unique fashion and often ignore the established typographical terminology, Unicode includes two characters U+00AF ¯ macron (formerly spacing macron) and U+203E ‾ overline that both look like an overlined space in most fonts, similar to a mirror‌ed underscore symbol. An overline proper can be encoded as a Unicode diacritic; see below.