PCGS may refer to:
* Parallel communicating grammar systems,
grammar systems working on their own string and communicating with other grammars in a system by sending their sequential forms on request.
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Preconditioned conjugate gradient
In mathematics, the conjugate gradient method is an algorithm for the numerical solution of particular systems of linear equations, namely those whose matrix is positive-definite. The conjugate gradient method is often implemented as an iterati ...
square method, a variant of the
preconditioned conjugate gradient method – an algorithm for the numerical solution of systems of linear equations whose matrix is symmetric and positive-definite.
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Professional Coin Grading Service
Professional Coin Grading Service (PCGS) is an American third-party coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's former president David Hall, ...
, an authentication and grading service for rare coins started by seven coin dealers in 1985 to standardize coin grading.
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