Here's what it means:
* It represents two colorless energy. This means you can use the energy symbol in place of any two basic energy cards (e.g., Grass, Fire, Water, etc.).
* It is a universal energy symbol, meaning you can use it to power any Pokemon card, regardless of its type.
* It is a versatile symbol, offering a way to quickly generate energy for any Pokemon.
The Double Colorless energy symbol is particularly helpful for players who want to build decks that rely heavily on colorless energy, such as decks with lots of Special Energy or Pokemon that have colorless attacks.
It's important to note that the Double Colorless energy symbol does not have any inherent value in the game; its value is determined by the Pokemon that it is attached to and the attacks that are being powered.