Klein may refer to:

People

Klein (surname) Klein is the German language, German, Dutch language, Dutch, Afrikaans, and Yiddish word for "small", which came to be used as a surname, and thence passed into the names of places, concepts and discoveries associated with bearers of this surname.ht ...

* Klein (musician)

Places

* Klein (crater), a lunar feature * Klein, Montana, United States * Klein, Texas, United States * Klein (Ohm), a river of Hesse, Germany, tributary of the Ohm * Klein River, a river in the Western Cape province of South Africa

Business

* Klein Bikes, a bicycle manufacturer * Klein Tools, a manufacturer * S. Klein, a department store * Klein Modellbahn, an Austrian model railway manufacturer

Arts

* Klein + M.B.O., an Italian musical group * Klein Award, for comic art * Yves Klein, French artist

Mathematics

Klein bottle In mathematics, the Klein bottle () is an example of a Orientability, non-orientable Surface (topology), surface; that is, informally, a one-sided surface which, if traveled upon, could be followed back to the point of origin while flipping the ...

, an unusual shape in topology *

Klein geometry In mathematics, a Klein geometry is a type of geometry motivated by Felix Klein in his influential Erlangen program. More specifically, it is a homogeneous space ''X'' together with a transitive action on ''X'' by a Lie group ''G'', which acts as ...

* Klein configuration, in geometry * Klein cubic (disambiguation) * Klein graphs, in graph theory * Klein model, or Beltrami–Klein model, a model of hyperbolic geometry * Klein polyhedron, a generalization of continued fractions to higher dimensions, in the geometry of numbers * Klein surface, a dianalytic manifold of complex dimension 1

Other uses

* Kleins, Lineman's pliers, a hand tool used by electricians and others * Klein Technique, a movement/dance technique developed by Susan Klein and studied by