Since Unicode 1.1, there have been two similar superscript characters: IPA (U+02E4 ) and Semiticist (U+02C1 ). U+02E4 is formally a superscript (U+0295 , = reversed glottal stop), and in the Unicode charts looks like a simple superscript , though in some fonts it looks like a superscript reversed lower-case letter glottal stop . U+02C1 is a typographic alternative to (U+02BF ); which is used to transliterate the Semitic consonant ayin and which = reversed , which itself transliterates the glottal Semitic consonants aleph and hamza. In the Unicode charts U+02C1 looks like a reversed (U+02C0 ), which is used in the IPA for glottalization. There is no parallel Unicode distinction for modifier glottal stop. The IPA Handbook lists U+02E4 as the Unicode equivalent of IPA Number 423, the dedicated IPA symbol for pharyngealization.
