I love that @Shopify's logo spacing rules are measured in shopping bag units.

https://press.shopify.com/brand

https://cdn.shopify.com/assets2/press/brand/logo-spacing-main-small-71170d22c26427e06a1dc0634c70a271.png

https://cdn.shopify.com/assets2/press/brand/logo-spacing-glyph-small-b1442dfdd56c5a547e531e52287ba4a3.png