Calculator spelling

Rarity: Common

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What Wikipedia says

Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet.

Excerpt from the Wikipedia article “Calculator spelling”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The original uploader was Mysid at English Wikipedia., CC BY-SA 3.0, via Wikimedia Commons.