While designing for Mater, I created the logo for the Student Placement Online Tool (SPOT). The logo needed to have an element that indicated the business was online (the hyperlink referenced underling of the word Online) while also referencing the acronym SPOT (the stylised letter O in the word SPOT).
AppSumo deal
I often use AppSumo to get great deals on graphic and development software. Now you can get $10 (after your first purchase) when you sign up at AppSumo too. Full disclosure, I also get $10.