I have a laptop power brick with this symbol on it.

It reminds me of a Class II symbol:

but is, obviously, different.

The central symbol looks like a noiseless (clean) earth (ground) symbol (see here):

It's unclear what the two symbols might mean if they're nested.

3 Answers

This is symbol "IEC 60417-6092" and is used on equipment having a power supply cord where a conductor with green-and-yellow insulation is used only to provide a FUNCTIONAL EARTHING connection. Source: UL 60950-1 2nd ed. That means that accessible metal parts, outputs, etc. are double or reinforced insulated from mains, but can be connected to earth terminal via power cord for a "functional" reason - Can be electromagnetic compliance, filtering noise, getting rid of static or anything else not related to electrical safety.

This is symbol is meant to "identify a piece of class II equipment with the functional earthing (grounding)." (Source)

Function/description : To identify a noiseless (clean) earth (ground) terminal, e.g. of a specially designed earthing (grounding) system to avoid causing malfunction of the equipment

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