Qamatz ħatuf (קָמָץ חָטוּף) or qamatz qatan (קָמָץ קָטָן), the “little qamatz” is a short O-Class vowel.

It usually appears identical to the regular qamats, being represented by a horizontal line beneath the letter with a teardrop or do underneath it, sometimes merged and represented as a simple “T” shape.

The short O-Class qamatz ħatuf sounds like the “o” in token.

See: niqqud