pebi-

Etymology
.

Prefix

 * 1) The IEC prefix meaning 250 = 1,0245 = 1,125,899,906,842,624. Compare peta-, meaning 1015 = 1,0005 = 1,000,000,000,000,000, a quadrillion.

Usage notes
Not yet in widespread use, this binary multiple prefix was established to make various units used in computing precise.