Horsepower
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Horsepower is apparantly a unit of thrust. According to NASA:
MEDIA ADVISORY : M11-063 (March 18, 2011)
NASA Releases First-Ever HD Footage Of SRB Recovery Ship Mission
CAPE CANAVERAL, Fla. -- For the first time, NASA has released high-definition video taken during the retrieval of solid rocket booster segments from the Atlantic Ocean. The solid rocket boosters provided 144 million horsepower of thrust for the final launch of space shuttle Discovery on its STS-133 mission.