MMSCFD - Million standard cubic feet of gas per day - a common volume of gas measure (unit abbreviation MMscf)
SCFD - Standard cubic feet per day (gas)
SCFM - Standard cubic feet per minute (gas)
Sm^3/hr - Standard cubic metre per hour defined at 15 deg. C - 59°F - for US
Nm^3/hr - Normal cubic metre per hour defined at zero deg. C - 32°F - for countries using SI metric system of units
MSm^3/d - Mega Standard Cubic Metres per day defined at 15 deg. Celsius - 59° Fahrenheit - outside of US