An Indy grab, also known as an Indy air, is an aerial skateboarding, snowboarding and kitesurfing trick during which the rider grabs their back hand on the middle of their board, between their feet, on the side of the board where their toes are pointing.
The Indy grab is one of the basic tricks in vert skating and is usually combined with spins, kickflips and heelflips.
[1] By 1980, the trick was renamed the Indy air, after the Independent Truck Company by skateboarder Duane Peters (who popularized this grab around 1980).
[2] The trick involves doing a backside air while gripping one's board on the toe side, between the feet with the trailing hand.
This confusion is partly due to the name being applied to all such grabs in the Tony Hawk's Pro Skater video game.