Can You Determine the Missing Symbol?

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In the above picture, what symbol goes in the bottom right position?

Scroll down for a clue and further down for the answer.

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Clue: This is a number puzzle.

Scroll down for the answer.

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Answer: 88. The picture contains single digits that are flipped. eg the top left position contains the number 2 and the number 2 flipped hence creating a new symbol. The only number not appearing in the puzzle is the number 8 hence the number 8 adjacent to the number 8 flipped is the answer. The puzzle can also be viewed as a magic square with all rows and columns having the sum of 15 hence the bottom right position is 8 and following the rule of the puzzle, the answer must be 8 next to 8 flipped- 88.