Etymology
Today it means: Strictly, 2⁹⁰ (1024⁹, 1,237,940,039,285,380,274,899,124,224) bytes or 2¹⁰ (1024) yobibytes, as opposed to a ronnabyte. Full definition →
From robi- + byte.
Etymology from Wiktionary, CC BY-SA 4.0.