yottabyte

This term represents the largest officially recognized unit of digital information in the International System of Units (SI). It is used almost exclusively in theoretical discussions regarding future data growth, planetary-scale computing, or the total sum of digital information in existence, as current hardware capabilities are far below this scale.

Because it describes a specific unit of measurement, it follows standard counting rules for data units. However, in technical specifications, it is often represented by the symbol YB to avoid repetitive spelling in large-scale data projections.