For those who wants to use the icon font from KivyMD, but not wants to use the entire project.
Follow to KivyMD.
pip install git+https://github.com/gottadiveintopython/KivyMD-Icon.git#egg=kivymd
Same as KivyMD thus you don't need to modify code when you switch to KivyMD.
#:import md_icons kivymd.icon_definitions.md_icons
Label:
text: md_icons['clock']
font_name: 'Icons'