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87
flipped over and mirrored it is a sequence: 86, 87, 88, 89, 90, 91
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an upside down 87 for to complete the sequence 86,87,88,89,90,91 all upside down
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My guess: 87. It's because this row is actually:
86 87 88 89 90 91 flipped over
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I think the missing digit should be 78.
At first I wrote all digits turning the upside down, then I get
91,90,89,88(?)86
Then obviously appear the missing number as87i.e 78(inverting 87)
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Here is the answer to your question, the symbol you have asked about is commonly called a question mark. It is a form of punctuation that indicates a question. I came up with this answer because that I noticed that although you originally presented this symbol within a string of Arabic numbers when it came time to ask your question you made no reference to the symbol representing any sort of number or that your question was in regards to any sort of mathematical puzzle.
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It should be 78. Upside down these numbers go: 91, 90, 89, 88, __, 86. The missing number in the upside down sequence is 87, so right side up it should be 78.
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The addition number their is 10 because 16,06,68,88,10,98
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