U+1DF0E Latin Letter Inverted Glottal Stop with Curl

The Wikipedia has the following information about this codepoint:

Various letters have been used to write the click consonants of southern Africa. The precursors of the current IPA letters, ⟨ǀ⟩ ⟨ǁ⟩ ⟨ǃ⟩ ⟨ǂ⟩, were created by Karl Richard Lepsius and used by Wilhelm Bleek and Lucy Lloyd, who added ⟨ʘ⟩.

Also influential were Daniel Jones, who created the letters ⟨ʇ⟩ ⟨ʖ⟩ ⟨ʗ⟩ ⟨ʞ⟩ which were promoted by the IPA from 1921 to 1989, and were used by Clement Doke and Douglas Beach.

Individual languages have had various orthographies, usually based on either the Lepsius alphabet or on the Latin alphabet. They may change over time or between countries. Latin letters, such as ⟨c⟩ ⟨x⟩ ⟨q⟩ ⟨ç⟩, have case forms; the pipe letters, ⟨ǀ⟩ ⟨ǁ⟩ ⟨ǃ⟩ ⟨ǂ⟩, do not.