Artifact : Artefact 

In an archaeological sense, an artifact is any object discarded or lost by a previous human culture, and later recovered by some archaeological endeavor. Prehistoric artifacts might include stone tools such as projectile points, ceramic sherds, or grinding slabs; historic artifacts include objects made of glass, metal, brick, concrete, mortar, ceramic, and the like.

In observational science and particularly signal processing, an artifact is any perceived distortion, error, or addition caused by the instrument of observation (signal processor). For example, a compression artifact is a noticeable error caused by lossy data compression of digital audio or video data. A similar usage applies in printing and graphic design, where an artifact is a visible blemish not present in the original image or plate.

In biological microscopy an artifact is any distortion or addition caused by the sample preparation process.

In role-playing games and fantasy literature, an artifact is a magical object with some marvelous and alarming power, so great that it cannot be duplicated by efforts of the player characters, and cannot be destroyed by ordinary means. Artifacts often serve as MacGuffins, the central focus of quests to locate, capture, or destroy them. The One Ring of The Lord of the Rings is a typical artifact: alarmingly powerful, of ancient and obscure origin, and almost indestructible.

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