snail image is a good metaphor for slow motion but if used as a road sign it will conflict with literal and partially conventional meaning "snails on the road"). Defining the pictogram can be different for the toolbar and other functional icons in the interface and for the icons representing independent software applications or websites which are closer to logotype or mascot design. Notable icon designers Susan Kare, one of the early professional icon designers, designed many of the icons contained within the Classic Mac OS. Jon Hicks created the icon for the Firefox Browser and the emoticons for Skype. He's also the author of the Icon Handbook. Stefan Dziallas aka Iconwerk, a German icon designer famous for his icons for the top brands See also Icon (computing) Skeuomorph Iconfinder The Noun Project References External links iOS Human Interface Guidelines — App Icon macOS Human Interface Guidelines — Designing App Icons Microsoft Design Language — Icons Microsoft Icon guidelines for UWP apps Microsoft guidelines on designing Windows Aero Icons Microsoft guidelines on designing Windows XP icons Android guidelines on icon design