Grip a handhold that is above and to the side of the body with the hand in a thumbs down position. This is a potentially dangerous body position because of the stress placed on the rotator cuff of the shoulder.
Also known as the "lift-opener". Inelegant but sometimes necessary manoeuvre where the fingers of both hands are placed in a crack as if to pull it apart by brute strength. Very tiring; hard to stay balanced. Can be required in shallow cracks where there is no chance of jamming or laybacking for some reason. Named after French climber Gaston Rébuffat.
Abbreviation for Glace Atmosphere sur Terre et Ocean Numeriques, a group performing numerical simulations of coupled ocean, atmosphere and ice models. For further details, see the GASTON Web site.