Calculator Spelling, often referred to as beghilos, is a classic schoolroom pastime where numbers on a seven-segment display are used to form words when viewed upside down. The most famous example is 58008, which spells 'BOOBS', but other variations include 0.7734 for 'HELLO' and 71077345 for 'SHELL OIL'. This form of digital wordplay has been a rite of passage for students since the 1970s, serving as a silent way to share jokes in math class. In meme culture, it is used to evoke nostalgia for childhood boredom, technical ingenuity, and the simple joy of finding hidden messages in everyday technology.