Erayada ka bilowda xarafka O ee Xisaabta
- Oblique: Janjeedh
- Oblique angle: Xagal janjeedh
- Oblique axis: Dhidib janjeedha
- Oblique cone: Toobin janjeedha
- Oblique coordinates: Kulanno janjeedha
- Oblique line: Xarriiq janjeedha
- Oblique plane: Sallax janjeedha
- Oblique prism: Birisam janjeedha
- Oblique triangle: Saddex xagal janjeedha
- Obtuse angle: Xagal furan
- Octagon: Siddeed geesle
- Octagon, regular: Siddeed geesle habsan
- Octahedron: Siddeed salxaale
- Odd: Kisi
- Odd function: Fansaar kisi ah
- Odd number: Tiro kisi ah
- Odds: Saami baqti iyo nasiib
- Operation, binary: Xisaabfal labaale
- Ordered pair: Lammaane horsan
- Ordinate: Oordhinayt
- Origin: Unug (bar asal)
- Origin of Cartesian ordinate: Unugga kulannada Kaartis
- Orthogonal: Qotome
- Orthogonal circles: Goobooyin isku qotoma
- Orthogonal curves: Xoodad isku qotoma
- Outcome: Natiijo
- Outcome space: Natiijo dululaati