Some icons are more familiar than others. Here is a set of icons, that are generally used across multiple applications and equipment for different subject domains — so if you decide to use them, they are more or less familiar to user, and, for instance, you can avoid unnecessary labels (of course, think first and test).
The icons are rated as very recognizable, more or less recognizable, and recognizable in specific subject domain (for instance, among automotive dashboards or text processors).
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