On a 1987 Jeep Wagoneer what does the blue dashboard light with a circular shape and five horizontal linesbars coming out of it mean?

Are you talking about the High Beam headlight indicator? That light is telling you your high beam lights are on. try turning off your high beam lights and see if the light goes away. If is stays on but the lights are not on high beam then its just an electrical issue, either pull the bulb out or cover the light with electrical tape if it bothers you!