Alpine distress signal

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The Alpine distress signal is a distress signal in the case of mountain emergency, an emergency in alpine areas. It involves repeating a sound or other signal six times within a minute, then pausing for a minute before repeating. There are also special emergency call numbers, for use with the telephone service by which the emergency services can be contacted.

The signal was introduced in 1894 on the suggestion of Clinton Thomas Dent and was soon adopted internationally.