The story
Derived from the letters available on an upside-down calculator screen, those letters being: 'b', 'e', 'g', 'h', 'i', 'l', 'o', 's' and 'z'.
Etymology from Wiktionary, CC BY-SA 4.0.
beghilos
Today it means: The alphabet consisting of the letters that can be spelled out when a traditional calculator screen is viewed upside down. Full definition →