One-fifth (sometimes one-sixth) of an em wide. Recommended for use as a thousands separator for measures made with SI units. Unlike U+2002 to U+2008, its width may get adjusted in typesetting.
com.typemytype.robofont.mark
0.93
0.9
0.98
1.0
interface.gridadjust.original
{'width': 575, 'leftMargin': 0, 'rightMargin': 0}