O could be for Oneiric Ocelot, but we’ll spare you. Canonical, developers of Ubuntu, name their releases after an animal, together with an adjective – the adjective describing some aspect of the animal’s behaviour – eg Maverick Meerkat. Daft, yes, but a bit of fun. The most recent release is Precise Pangolin, and Quantal Quetzel is being released next week. If nothing else, Canonical’s naming is great fodder for playing the alphabet animal game on long car journeys.