I've referenced many symbol sheets with no avail.
What would JP5 'AutoON' be here? I assume it's a switch that is default on, but the symbol is foreign to me.
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The symbol and 'JP' label suggest that it is a jumper used to bypass the switch.
Figure 1. A 2-pin jumper on a 5-way pin header. Image source: Sparkfun.
It's a circuit breaker symbol used incorrectly to indicate a jumper block. Given that this symbol is quite universal, its misuse is misleading - the schematic's author might as well used no symbol besides the two terminals, and with the JP reference designator it'd have been obvious still what it is.