What does μ, n and m mean in front of the impact category unit?

To make the numbers easier to read we utilise the metric unit prefixes.

M = mega, 10^6

k = kilo, 10^3

m = milli, 10^−3

μ = micro, 10^−6

n = nano, 10^−9

kg = 1000 g

T = ton = 1000 kg

547 g CO2 eq => 0,547 kg CO2 eq

10.33 k m3 => 10330 m3

34.31 m DALY => 0,3431 DALY