Etymology
Today it means: Strictly, 2⁸⁰ (1024⁸, 1,208,925,819,614,629,174,706,176) bytes or 2¹⁰ (1024) zebibytes, as opposed to a yottabyte. Full definition →
From yobi- + byte.
Etymology from Wiktionary, CC BY-SA 4.0.