I'm a military pilot and a mechanical engineer. I'm trying to find out what the "+" symbol which randomly appears on the surface of almost every avionic component face plate on my aircraft is for. I've been told it was a "grounding" point which I assumed to mean a static discharge point to touch prior to maintenance. Since the entire face of these components are metal with no bare spots under the "+" I'm not sure what makes that particular location significant. Is this "standard" electrical engineer symbology?
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