This superscript symbol is deprecated[1] and is no longer the official standard for rhotacized vowels. ◌˞ (vowel with hook diacritic) is now the standard.
^ Superscript modifier letters are intended for cases where the letters carry a specific meaning, as in phonetic transcription systems, and are not a substitute for generic styling mechanisms for superscripting of text, as for footnotes, mathematical and chemical expressions, and the like.