What does this symbol mean?

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Martinhughes

Joined Oct 22, 2019
2
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What does the upside down ‘U’ symbol with the line at thebase mean and what is it warning me about. Is it saying I need a shunt?
 
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BobaMosfet

Joined Jul 1, 2009
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AlbertHall

Joined Jun 4, 2014
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