What does a component with a Filled Diamond mean?

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1

My apologies if this is basic information. I have searched and searched for : filled diamond, filled instance icon, diamond, instance, components and have not found an answer.

What does a component with a Filled Diamond mean?

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2

This is a variant:
https://help.figma.com/hc/en-us/articles/360056440594-Create-and-use-variants