Some short-u diacritics:
Some long-u diacritics: Dev. ू, Gur. ੂ, Guj. ૂ.
Dogri uses a variety of under-marking gestures for the -u, theoretically a single stroke for the short-u and a double stroke for the long, if we are lucky to get any marking at all. Often a formal nagari form is used, as on the second scan below:
masūl bākī ~ postage due.
The sa has taken a double-stroked diacritic at the bottom to give
“Jambu,” with the nagari-style long-u diacritic in the bū element.
Long-ū or short-u. Also -i and -o.
asū 29 ~ October 13. Hybrid rendering, with the sū
in Punjabi form. The diacritic below marks the long-u.
And again as a diacritic under the m-version instead.
And yet another, in the red at the top.