def to_string(unit_system: str, unit_category: str, value: float, precision:
    int=3, split_unit: bool=False, compatible_unit: bool=False) ->str:
    """Convert a given input float value into a string with units. 

    :param unit_system: The unit system, from bpy.utils.units.systems. 
    :type unit_system: str
    :param unit_category: The category of data we are converting (length, area, rotation, etc.), from bpy.utils.units.categories. 
    :type unit_category: str
    :param value: The value to convert to a string. 
    :type value: float
    :param precision: Number of digits after the comma. 
    :type precision: int
    :param split_unit: Whether to use several units if needed (1m1cm), or always only one (1.01m). 
    :type split_unit: bool
    :param compatible_unit: Whether to use keyboard-friendly units (1m2) or nicer utf-8 ones (1m²). 
    :type compatible_unit: bool
    :return:  The converted string. 
    """
    pass
