In the section "Property Summary" there is a question "Is this a collectible item". What exactly does this mean?

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Collectibles

A collectibles gain or loss is any long term capital gain from the sale or exchange of a collectible that is a capital asset. Collectibles include works of art, rugs, antiques, metals (such as gold bullion), gems, stamps, coins, alcoholic beverages, and certain other tangible property.

Collectibles gain is subjected to a maximum capital gain rate of 28% as opposed to the maximum 15% rate that most other long-term gains are subjected to.