A simple angle measuring instrument or for entering an angle is called goniometer or protractor.
It consists of a circular or semi-circular disc with angular graduation.
The disc is usually made of plastic or sheet metal.
Often goniometers are also integrated in drawing or set squares.
More accurate goniometers have a swivelling rail with a scale with length graduation to milimeters, which can be fixed at the desired angle.

Goniometer in Plastic Industry by KDP

Measuring Technology: Goniometer with swivelling rail

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.