Swedish term (edited): firnings- och s�kringsteknik

Definitioner från två klättringsordlistor online (länkar för referens nedan)

Rappel (or "Rap"):
To descend a fixed rope by means of mechanical braking devices.

Abseil:
German term (also employed by the British) for rappel; a method for descending a fixed rope by means of sliding and braking mechanisms known as belay devices.
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Abseiling:
Descending by sliding down a rope. Americans usually call this rappelling.

Rappel, to:
Also: to rap. Descending by sliding down a rope. Known in Britain (and Germany) as abseiling.

Belay, to
To secure a climber.
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Belay station
A safe stance consisting of an anchor, a rope, and a belayer (aka "the belay")
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Belayer
The person at the belay station securing the climber.
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Belay on
When the belayer is ready to belay the climber up, he yells "Belay on". (At least in the US, "belay on" would only confuse the hell out of a British climber who prefers to hear "Climb when ready").