10-20 system may refer to:
*
10-20 system (swimming safety), a technique used by lifeguards
*
10-20 system (EEG) 10-20 system may refer to:
* 10-20 system (swimming safety)
A lifeguard is a rescuer who supervises the safety and rescue of swimmers, surfers, and other water sports participants such as in a swimming pool, water park, beach, spa, river ...
, an electrode placement method used in electroencephalography systems
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