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A 'standard cubic foot' (abbreviated as scf) is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit and either 14.696 pounds per square inch (1 atm) or 14.73 PSI (30 inHg) of pressure. See standard temperature and pressure.
A standard cubic foot is thus not a unit of volume but of quantity, and the conversion to normal cubic metres is not the same as converting cubic feet to cubic metres (multiplying by 0.0283168...), since the standard temperature and pressure used are different. Assuming an ideal gas, a standard cubic foot using the present convention of 14.73 PSI represents 0.0026412 lbmols, or 1.19804 gram moles, equivalent to 0.026853 normal cubic metres.
'Trillion cubic feet', commonly abbreviated as 'Tcf', is used in the oil and gas industry. The term trillion in this case refers to 10¹², the short scale definition employed by most English speaking countries.