The 1$ Coin is an item from Silent Hill 4: The Room. The coin is named so because the symbol is fictional and is most likely meant to resemble $1. Henry Townshend initially obtains the coin inside the northeast subway cars on the Lynch Street Line Platform of the Subway World. The coin is inside a toy train that must be unlocked using a toy key; however, the coin is much too filthy to be used. After washing the filthy coin in his kitchen sink, Henry can use the coin to retrieve the murder scene key from the vending machine, which is marked with the same symbol as the coin.
The design of the symbol on the coin may have been inspiration by the theory that the dollar sign was, originally, the number eight with a slash through it.