A bus resistor is a component consisting of several resistors in one package. The resistors are all tied together with a common pin on one side, and broken out through individual resistors to individual pins.

If you ever find yourself connecting a bunch of the same-value resistors from your power bus or to your ground bus these are probably the solution. These are ideal for use as current limiting resistors where multiple LEDs are present or as pull-up and pull-down resistors for dip switches and push buttons.

This specific bus resistor has 5 x 330 Ohm Resistors and a common pin denoted by a black dot.