U+A75C Latin Capital Letter Rum Rotunda

The Wikipedia has the following information about this codepoint:

The r rotunda ⟨ ꝛ ⟩, "rounded r", is a historical calligraphic variant of the minuscule (lowercase) letter Latin r used in full script-like typefaces, especially blackletters.

Unlike other letter variants such as "long s" which originally were orthographically distinctive, r rotunda has always been a calligraphic variant, used when the letter ⟨r⟩ followed a letter with a rounded stroke towards the right side, such as ⟨o⟩, ⟨b⟩, ⟨p⟩, ⟨h⟩ (and ⟨d⟩ in typefaces where this letter has no vertical stroke; as in ⟨ẟ⟩, ⟨ꝺ⟩ and ⟨ð⟩). In this way, it is comparable to numerous other special types used for ligatures or conjoined letters in early modern typesetting.