HALO

Noun

 * 1)   A type of skydiving where one leaves the launch platform from a high altitude and opens the parachute at a very low altitude.
 * When you have enough experience, you can do a HALO jump.
 * Weather balloons at maximum altitude are considered HALOs.
 * Weather balloons at maximum altitude are considered HALOs.
 * Weather balloons at maximum altitude are considered HALOs.