Artefacts

An artifact (U.S.) or artefact (U.K.) is:

A human-made object, such as a tool, weapon or ornament, especially those of archaeological or historical interest.
A human-made object that is a prototype or standard of measurement.
A structure or feature, visible only as a result of external action or experimental error. Also known as disturbance in biopotential signals.
Artefact is a fulltext information retrieval system capable of searching through databases containing documents written in a natural language [1]

See also