- prefix 1012; one million million.
- A metric prefix representing 1012, which is equal to a trillion. For instance, 1 terahertz is equal to 1012 Hz, or 1,000,000,000,000 Hz. When referring to binary quantities, such as bits and bytes, it is equal to 240, or 1,099,511,627,776, although this is frequently rounded to a trillion. To avoid any confusion, the prefix tebi- may be used when dealing with binary quantities. Its abbreviation is T.