The rubber circles around the top of cup lids are buttons to mark what type of drink it is such as diet and other.
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A heptagon is a polygon that has seven sides and can be regular or irregular in shape. Examples of heptagons include coins, pill boxes, cookie tin lids and architecture.
In the US, a stop sign. Some tables. Some pickle jars lids. Designer mirrors. Picture frames, planters, clocks, old schoolhouses, UFC fight enclosures