Floating-point unit - Wikipedia
https://en.wikipedia.org/wiki/Floating-point_unit
A floating-point unit (FPU, colloquially a math coprocessor) is a part of a computer system specially designed to carry out operations on floating-point numbers. Typical operations are addition, subtraction, multiplication, division, and square root.
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Floating-Point Unit (FPU) instructions set
http://linasm.sourceforge.net/docs/instructions/fpu.php
Free floating-point register. FINCSTP. Increment FPU register stack pointer. Store FPU status word without checking error conditions. FCLEX. Clear floating-point exception flags after checking for error...
FPU - OSDev Wiki
https://wiki.osdev.org/FPU
The x86 FPU was originally an optional addition to the processor that was able to perform floating point math in hardware, but has since been integrated into the CPU proper and has collected over the years the majority of math-heavy instructions.