Numbers are often used in combination with other words.
am - midnight to noon/midday - pm - noon/midday to midnight
% - percent or per cent
hrs / hrs. - hours (time)
km/h - kilometres per hour
mph - miles per hour (How many km is one mile?)
m2 - square metres (vierkante meter) m3 - cubic metres (kubieke meter)
° C - degrees Celsius - ° F - degrees Fahrenheit