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I searched on-line, because I've never seen this symbol... on one of the CAD sites, it calls it a change over switch or an intermediary change over switch..
Found it here

@Mbit would know.
If I had to guess from the small part of the print you shared it is an emergency call button for a refrigerated area if someone get locked in. The lights come from the alarm and the unit is csc21, Call station in compartment 21.
I agree with the call button.. "Help! let me out!"
 
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