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A-basis

at least 99% of the material is expected to meet or beat this number, with 95% confidence.

B-basis

at least 90% of the material is expected to meet or beat it, with 95% confidence.

S-basis

the minimum from the material specification. no statistical guarantee behind it.

typical

a manufacturer-measured average. not a design allowable.

Ftu / Fty

ultimate tensile strength / tensile yield strength.

Fcy / Fsu

compressive yield strength / ultimate shear strength.

L / LT

grain direction: longitudinal (rolling direction) / long transverse (across it). blank means the table gives one value with no direction.

temper

the heat treatment or work-hardening state, like T6 or H900.