Beam may refer to:
Beam (structure), a structural element
Beam (nautical), the most extreme width (or breadth) of a nautical vessel,
A narrow, propagating stream of particles or energy:
Charged particle beam
Soon after this be subdued the Pisidians who made head against him, and conquered the Phrygians, at whose chief city Gordium (which is said to have been the seat of the ancient Midas) he saw the famous chariot fastened with cords made of the bark of the Cornel-Tree, and was informed that the inhabitants had a constant tradition, that the empire of the world was reserved for him who should untie the knot. Most are of opinion, that Alexander finding that he could not untie it, because the ends of it were secretly folded up within it, cut it asunder with his sword, so that several ends appeared. But Aristobulus tells us that he very easily undid it, by only pulling the pin out of the beam which fastened the yoke to it, and afterwards drawing out the yoke itself.