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On many old-style calculators, some numbers look like letters when you turn them upside-down, and some (1, 0, 5, 8) look like letters either way (I, O, S, and B).

However, to imitate the word "BLOOD" in this manner, you would need a P to start the string P0018, which inverted looks like "8I00d."

The famous use of this type of false text is the number 710.77345 which when flipped over would look like "ShELL.OIL"

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Q: How do you spell Blood on a calculator?
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