Spawn Beacon

A spawn beacon is a device that allows squad members to spawn at that point, rather than at other spawn points available to all players.

Proper use of a spawn beacon can give the squad the ability to flank an oncoming force, or to overcome mobility problems (i.e. other spawn points are too far away). Improper use can result in players being too far from action, or the beacon being camped.

Battlefield 2142
The Squad Leader Spawn Beacon (SLSB) is usable by squad leaders with at least one other member. The beacon replaces the squad leader's own spawn point (which he cannot himself use). The squad leader does not recover his own spawn point until he picks up his beacon or respawns without an active beacon.

Battlefield 3
The Radio Beacon gadget may serve the same purpose.