- a large, flightless, ratite bird, Emu (Dromaius) novaehollandiae, of Australia, resembling the ostrich but smaller and having a feathered head and neck and rudimentary wings.
- a large Australian flightless bird, Dromaius novaehollandiae, similar to the ostrich but with three-toed feet and grey or brown plumage: order Casuariiformes
- European Monetary Union
- Economic and Monetary Union
- See e.m.u.
- electromagnetic unit
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