Spinnaker pole

There, one of the control lines of whichever sail it is to be used with is run through a fitting on the other end of the spinnaker pole.

This allows for more precise control of the corner of the sail to which the line is attached.

For a spinnaker, the line attached to the pole is the guy, or brace, and the corner is the tack.

For other headsails, such as a jib, the line would be the sheet, attached to the clew.

A downhaul or foreguy runs down so that the height of the pole is under positive control at all times.