Beta (climbing)
Encyclopedia
Beta is climbing jargon that designates information about a climb. In rock climbing
Rock climbing
Rock climbing also lightly called 'The Gravity Game', is a sport in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the summit of a formation or the endpoint of a pre-defined route without falling...

 this may include information about a climb's difficulty, crux, style, length, quality of rock, ease to protect, required equipment, and specific information about hand or foot holds. For alpine climbs, beta may include information about the length and difficulty of the approach, availability of water on the climb and the approach, ease of exiting the route before completing it, descent information, perhaps even useful logistic information for climbs in foreign countries.

The original use of the term Beta in climbing is generally attributed to the late climber, Jack Mileski. "Beta" was short for Betamax
Betamax
Betamax was a consumer-level analog videocassette magnetic tape recording format developed by Sony, released on May 10, 1975. The cassettes contain -wide videotape in a design similar to the earlier, professional wide, U-matic format...

, a reference to an old videotape format largely replaced by the VHS format. This was actually a play on words, as Jack would often ask, "you want the beta, Max?"

Etiquette

It is considered proper etiquette in climbing not to give a climber beta unless they ask for it. Many climbers find it distracting if people shouting move or hold information at them while they are climbing. Also, a climber can only onsight
On-sight climbing
On-sight climbing means to attempt a rock climbing route for the first time without inspection or any form of "beta" ....

 a route if he or she has received no beta. If the climber has received beta from someone else before attempting a route for the first time, the subsequent successful ascent, if made without falls, it is called a flash.
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