BRB

(Internet) The state of being away from one's device while meaning to come back soon.

Initialism of big red button.

Initialism of Brazilian rainbow boa

Initialism of buckling-restrained brace: a structural brace in a building or other structure, designed to allow the building to withstand cyclical lateral loadings.

Initialism of bevelled-rim bowl or bevel-rimmed bowl (“a small, undecorated, mass-produced clay bowl, most commonly from the 4th millennium B.C.”).

(Internet) Initialism of be right back.