Relative dating As opposed to absolute dating, this gives no date, but instead a relative date (earlier/later) compared with other finds. This can be the case using stratigraphy.

Replicas is a New Wave / electronic album by Gary Numan and Tubeway Army, released in 1979. It was the second and final Tubeway Army LP, following a self-titled debut the previous year. It was also the first album of what Numan later termed the "machine" phase of his career, preceding The Pleasure Principle and Telekon, a collection linked by common themes of a dystopian science fiction future and transmutation of man/machine, coupled with an androgynous image and ground-breaking synthetic rock sound.

Reproductions of stamps sold during the early days of collecting. Usually printed in one color on a sheet containing a number of different designs. Replicas were never intended to deceive either the post office or the collector.