If you are using Custom Post Types or creating plugin option pages, you will need to create menu icons for them. That is, if you want to follow the good practice of making the UI as friendly as possible for your clients.
Matthias Kretschmann has created a perfect tutorial including an icons template to get you started. With this tutorial in hand you really have no excuse to leave the default cog icon instead of cooking up something tastier, so go ahead and visit this tutorial for the details!
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