quad

1

Convert between quads and other major units of energy.

In the United States, 1015 (1 quadrillion, American style) British thermal units, approximately 1.055 × 10¹⁸ joules. This unit is used for such purposes as reporting the total annual energy consumption in the American economy. One quad is roughly the amount of energy in:

2

“A proposed large unit of length = ten million metres, or approximately the length of an earth quadrant.”

Latimer Clark.
A Dictionary of Metric and Other Useful Measures.
London: E. & F. N. Spon, 1891.

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