Tetramodule is a vector space supplied with the bimodule and bicomodule structures over a Hopf algebra. The exact definition is given. Some properties and applications to quantum groups are discussed.

**ArXiv:** High Energy Physics - Theory, hep-th/9404043

**Comments:** 9 pages

**Journal-ref:** IMRN, No.7, 275-284 (1994).

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Revised December 1996