Why is Formula One's new protection system called halo? What will it look like?

HALO has divided opinion perhaps more than any other F1 innovation in recent years with drivers, team bosses, fans and pundits all taking differing sides on the issue.

from Daily Express :: F1 Feed http://www.express.co.uk/sport/f1-autosport/834241/Halo-head-protection-system-device-F1-safety-sportgalleries
via Express