What is lbf?

Some articles on lbf:

Midland Railway Johnson 0-6-0 - Dimensions - Later Dimensions
... Tractive effort 2900–3019 2F 40 tons 160 psi 4′ 10½″ 18″ × 26″ 19420 lbf 3020–3129 2F 40 tons 160 psi 5′ 2½″ 18″ × 26″ 18185 lbf 3130–3189 2F 40 tons 160 psi 4 ...
Toyota AR Engine - 1AR-FE
... Venza AGV10/15, 185 PS (136 kW 182 hp)@5800, 247 N·m (182 lbf·ft)@4200 Toyota Highlander ASU40, 190 PS (140 kW 187 hp)@5800, 252 N·m (186 lbf·ft)@4100 Toyota Sienna ...
Avro Canada Orenda - Variants
... Orenda 1 - original prototype models, 6,000 lbf (27 kN) Orenda 2 - first production model Orenda 8 - improved reliability, 6,000 lbf (27 kN) Orenda 9 - improved thrust, 6,500 lbf (29 kN), required some ...
Amateur Rocket Motor Classification - Motor Impulse By Class
... Impulse (Metric Standard) Total Impulse (Imperial Standard) A 1.26-2.5 N·s 0.28-0.56 lbf·s B 2.51-5.0 N·s 0.56-1.12 lbf·s C 5.01-10.0 N·s 1.13-2.25 lbf·s ...
Allison J33
... J31, enlarged to produce significantly greater thrust, starting at 4,000 lbf (18 kN) and ending at 4,600 lbf (20 kN) with an additional low-altitude ...