A-frame sign (also known as sandwich boards) is a two-faced sign. Each face of the sign joins at the top allowing for each face to extend outwards from the top giving stability to the sign. signs of this type are usually designed to be foldable. Some a-frame signs are designed to be wearable.
If you have made the connection that these signs resemble a type of foldable ladder, you would be correct. That type of ladder is called an a-frame ladder.
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