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A parametric font is a variable font where one or more of its axes are parametric axes, such as Roboto Flex or Amstelvar. Unlike expressive variation axes like Weight (wght) and Width (wdth), parametric axes adjust attributes of typefaces that are detailed, measurable, and have values that can be reused across fonts.

![The lowercase characters “para”, shown in black, with the values from the YTDE, XOPQ, YOPQ, and XTRA parametric axes shown close by. Minimum values are shown with a blue stroke; maximum values with pink.](images/thumbnail.svg)

Because many axis settings in parametric fonts result in visually unappealing fonts, it is recommended that users adjust parametric fonts by using the expressive variation axes first, then fine-tune using the parametric axes.

For more information, please read our article, “Introducing parametric axes.”