We are 
Thrust I guess (poussée)...
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Well assuming ISPxGo = Ve and Q the debit, we have Thrust :)
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I've never seen the symbol Q in these kind of equations, but that's probably thrust T, where Q Is the mass flow from the engine
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Definitely thrust. Q is the mass flux through the nozzle, gO is the gravitational acceleration and ISP is the specific impulse.
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