What does °Z mean?

The °Z scale is therefore used to determine the concentration of sucrose. 26 g of sucrose dissolved in pure water and filled to 100 cc solution at 20.0 ° C (atmospheric pressure, 1013 HPa) and at the wavelength 589.44 nm in a 200 mm sample tube has an optical rotation of 34.626° (± 0.001°). This solution is called normal sugar solution. It is used to calibrate and validate polarimetric methods and devices and is the starting point of the International Sugar Scales ° Z, defined by the ICUMSA. The rotation of 34.626 ° degree corresponds to a concentration of 26 g sucrose or 100.00 ° Z (sugar).