From Japanese-English FreeDict Dictionary ver. 0.1:
[news2] [nf37] [spec2] 升 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 枡 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 桝 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 斗 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, [news2] [nf37] [spec2] ます /mˈäsɯᵝ/, () マス /mˈäsɯᵝ/
1. (noun (common) (futsuumeishi))
measuring container, measure
2. box (seating at a theatre, etc.)
3. (esp. マス)
square on a grid, cell of a grid
4. (斗)
square bearing block (at the top of a pillar)