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I couldn't find anything on the web for it.

On first thought it might be an ESD protection diode because in the schematic, t appears near USB and stuff that might be sensitive.

enter image description here, here in context :

enter image description here

Thanks in advance

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Looks like these are PESD (Polymer ESD) devices, like in this schematic: enter image description here

Here is a datasheet of one of these.

The schematic and explanation can be found here.

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