I believe the reason it got to be called "standard" was because the weather parameters, 29.92 baro, 60deg, 0 humidity is what's known as "standard day" in aviation.
On the older superflow dyno sheets, it's right at the top of the sheet, "standard corrected data".
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
