NBSI

NBSI - Not Blue Shoot It

This means: if a player's standing is not set above 0 (neutral), which makes the pilot "blue" (with a positive standing), you are supposed to shoot the pilot on sight.

This is opposed to NRDS which means don't fire unless red (negative standing, or a red-flashy pirate).

NBSI and NRDS are the basic level of politics you decide to work on. Generally in lowsec a corporation or alliance will be either NRDS or NBSI in lowsec; and either NRDS or NBSI in 0.0.