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The spat (symbol sp), from the Latin spatium ("space"), is a unit of solid angle. One spat is equal to 4π steradians or approximately 41253 square degrees of solid angle (sequence A125560 in the OEIS). Thus 1 sp is the solid angle subtended by a complete sphere at its center.
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angle solid spat sp latin unit steradians a125560 oeis subtended sphere symbol spatium space one equal 4π approximately 41253 square
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