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There are six coins in a collection. There are 3 large coins and 3 small coins. For each size of coin, there is one coin with a circular hole in the middle, one with a square hole in the middle and one with a star-shaped hole in the middle. Each coin is kept in a box. All of the boxes are the same size. Each box has two symbols drawn on it. One of the symbols identifies the size of the coin and the other determines the type of hole in the coin, but they may be in either order. The box for the large coin with a circular hole has the symbols Ω and ℮ on it. The box for the small coin with a square hole has the symbols ⌂ and ∆ on it. A third box has the symbols ◊ and ⌂ on it.

Which coin could be placed in the third box?