Application icons
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Purpose
Application icons are the expression of an application's brand. They communicate the application's identity in a clear, bold, and friendly manner. While application icons should be distinct from one another, all icons should be unified with the same design style.
Design
Application icons always use the colorful icon style. Their baseline size is 48 pixels.
First-party application icons
When creating a Silver icon as your application's icon, there are some things you should consider.
Recognizability
Your application's icon should be distinct and recognizable.

Do: Use a distinct silhouette and set of colors. You can sample motifs from other icons where appropriate to help with recognizability.

Don't: Don't solely base your application's icon off of another icon. This can confuse users, and tarnish both the reputation of your application and the application whose icon you use.
Metaphor
Your application's icon should use an appropriate metaphor to inform the user what your application does.

Do: Use an appropriate metaphor for your icon. This will inform users as to what your application does.

Don't: Don't use inappropriate metaphors for your icon. This will confuse users as to what your application does.