- Within a computer application, a hidden message, function, feature, or the like. These may only be found through an obscure sequence of keystrokes, and may contain anything from an animated greeting to a different and complete working program.
- (written as Easter egg)A hollow egg-shaped chocolate confection given as a gift at Easter
- (written as Easter egg)A hard-boiled egg with the shell painted and decorated, regarded as a symbol of fertility or resurrection according to beliefs and given as a gift at Easter. In the UK, rolled down hills by children until broken.