A universal constructor may refer to:
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Universal assembler
A molecular assembler, as defined by K. Eric Drexler, is a "proposed device able to guide chemical reactions by positioning reactive molecules with atomic precision". A molecular assembler is a kind of molecular machine. Some biological molecul ...
, a hypothesized nanotechnology device for building a large class of nanomachines including itself
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Von Neumann universal constructor, an abstract device capable of constructing all constructible artifacts of an environment
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