m2 = m**2 = m2 = sq_meter = sq_m
m3 = m**3 = m3 = cu_meter = cu_m
cm2 = (cm)**2 = cm2 = sq_centimeter = sq_cm
cm3 = (cm)**3 = cm3 = cu_centimeter = cu_cm
ft2 = ft**2 = ft2 = sq_ft
ft3 = ft**3 = ft3 = cu_ft = cf
in3 = in**3 = in3 = cu_in
yd3 = yard**3 = yd3 = cu_yd
cfm = cf/minute = CFM
cfs = cf/second = CFS
yr = year = yr = y
hr = hour = hr = h
d = day
USD = usd
each = count = ea
unit = count
point = points
MM- = 10**6 = mm-
MGD = 1e6 * gallon / day
mgd = MGD