Label
A struct representing a ZX-Spectrum's FP calculator's real number data type.
See:
www.worldofspectrum.org/ZXBasicManual/zxmanchap24.html
dac.escet.urjc.es/~csanchez/pfcs/zxspectrum/CompleteSpectrumROMDisassemblyThe.pdf
wos.meulie.net/pub/sinclair/games-info/z/Z80Toolkit2.pdf