Geometric Dimensioning and Tolerancing (GD&T) is a symbolic language used on mechanical drawings to communicate design requirements. Engineering, manufacturing, and inspection personnel must all be fluent in this system to make it effective. But it's not as simple as just learning the symbols. GD&T can also be thought of as a design philosophy that integrates the function of the part into the tolerances.
Below is a sample GD&T drawing:
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