Excellent question. I’m so glad you asked.
A sub-logo is a smaller, alternate version of your main logo. It borrows the graphical elements, fonts and colour palette, then fashions them into a version that can be used for different applications. Sub-logos can be any shape. They usually form a more succinct, compact version of the logo. Sub-logos are quite often round to allow flexibility of use for social media profile images, watermarks, favicons and packaging.
Lunchbox Mini’s branding identity features a horizontal shaped logo and custom illustrated icons forming the logo mark. In certain situations this may look out of place, be difficult to read, or simply not quite ‘fit’. Imagine trying to squeeze her into a narrow, vertically oriented blog advertisement! Eep!