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This is just to make it easier to tell a 7 with a short top bar from a 1.

In French, the number 1 has an exaggerated upstroke (line from left) rather than a single vertical line, and the crossbar is often required to tell a 1 and 7 apart.

Similarly, a line may be placed diagonally thru a zero (0) to differentiate it from a capital O : ∅.

But in Danish, the exact opposite is done, where a line indicates a capital o (Ø).

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Q: Why do they put a line though the number seven?
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