This refers to a specific trading card. “Mewtwo” identifies the Pokmon character depicted. “056/172” indicates the card’s number within a particular set, and “Halloween” signifies a thematic connection to the Halloween holiday, likely reflected in the card’s artwork or release timing. As an example, the card might feature Mewtwo in a Halloween costume or be part of a special Halloween-themed Pokmon card set.
The significance of this item lies in its collectibility and potential monetary value. Factors influencing its worth include rarity, condition, and the popularity of both the Pokmon character and the Halloween theme. The historical context within the Pokmon Trading Card Game (TCG) is also relevant; limited edition or promotional cards released during specific periods often command higher prices due to scarcity and demand from collectors.