isometric paper
paper with dots on a equilateral triangular grid.
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Ariel commented
You can generate your own isometric paper:
https://incompetech.com/graphpaper/triangledots/
You can import your PDF to Goodnotes as a template:
https://support.goodnotes.com/hc/en-us/articles/360000115295-Adding-custom-templates-to-the-template-library