The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+025C forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 3 other glyphs.
The Wikipedia has the following information about this codepoint:
The term Reversed epsilon (U+025CɜLATIN SMALL LETTER REVERSED OPEN E) has multiple uses and may refer to one of the following articles:
In phonetics, it is used to indicate an Open-mid central unrounded vowel
In EU law, it is used to affirm safety standards compliance on some products. See CE mark#Reversed epsilon