Rough sawn (full dimensional) lumber.
2 inches x 4 inches x 96 inches (typically +100 inches).
Rough sawn lumber is larger than store bought S4S (surfaced “planed” 4 sides) lumber. Store bought “stud” lumber starts out as rough sawn lumber and is passed through a planer machine to smooth the four sides and it cut to 93 inches long.
Rough sawn lumber typically contains 30-50% more wood so please consider that when you are comparing prices.
Rough sawn (full dimensional) lumber has 5.3 board feet (bf). Store bought lumber has 3.5 bd ft.