It looks like a connector, or as the diagram is about a dynamo, a light.
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It is likely a connector, slight resemblance to IEC standard plug and socket symbol. Likely drawn in the circuit to make it clearer the separation between source and load.
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\$\begingroup\$ When I search for IEC standard plug and socket symbol symbols very similar shows up. Thanks! \$\endgroup\$– MiNiMeOct 2 at 19:26