FPU - Floating Point Unit
Computer processors are better at dealing with integers than with real numbers (a.k.a. floating point numbers). So when the CPU encounters a floating-point expresion (ie. 1.62 * 0.87359), it sends the problem to the FPU. The FPU is specifically designed to handle floating-point math, so it computes expressions invloving real numbers more efficiently. Floating point units used to be manufactured as individual chips, but they are now usually integrated into the CPU.
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