Kalmar "cyma reversa" tana nufin nau'in gyare-gyaren gine-ginen da ke nuna madaidaicin lankwasa a sama da maɗaukakiyar lanƙwasa a ƙasa, ƙirƙirar bayanin martaba mai siffar S. Ana kuma san shi da ogee ko ogee. An fi amfani da kalmar a fagen gine-gine da ƙira don bayyana irin wannan nau'in gyare-gyare ko kayan ado.
