ISO 21920-1:2021

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ISO 21920-1:2021 is an international standard focusing on Geometrical Product Specifications (GPS), specifically addressing Surface Texture: Profile. Part 1 of this standard, titled "Indication of surface texture," provides rules for representing surface texture using graphical symbols in technical product documentation. It's a part of the broader ISO/TC 213 technical committee and helps standardize how surface texture is depicted and understood in various engineering contexts.