damma

In the Arabic script, the vowel point for u, appearing as a small curl placed above a letter ( ـُ ) and designating a short u /u/. If the Arabic letter و (wāw) immediately follows, it indicates a long ū /uː/.

In Iranian Persian ـُ represents the vowel /o/. If the letter ـو immediately follows it represents the diphthong /ow/. This usage differs from other Arabic script languages and from classical Persian, in which the diphthong /ow/ did not occ

Alternative form of damma.