Meaning of FPU in English
Stands for "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.
English glossary of computer and Internet terms. Английский глоссарий компьютерных и Интернет терминов. 2012