The phrase "direction indicators" refers to the lights on a vehicle that are used to show which way the driver intends to turn. They help other drivers on the road to understand the driver's intentions and make the roads safer. Full definition
You'll receive updated trend direction indicators for more than a dozen different major domestic and international stock market indices each month. (stocktrendinvesting.com)
With direction indicators that are even slimmer than they were before. (porsche.com)
LEDs are also used for the rear direction indicators, taillights and brake lights, the additional brake light in the rear lid and the rear fog lights. (topspeed.com)