Kamatz
Kamatz or qamatz (Modern Hebrew: קָמָץ, IPA: [kaˈmats]; alternatively קָמֶץ qāmeṣ) is a Hebrew niqqud (vowel) sign represented by two perpendicular lines (looking like an uppercase T) ⟨ ָ ⟩ underneath a letter. In modern Hebrew, it usually indicates the phoneme /a/ which is the "a" sound in the word spa and is transliterated as a.