F() function documentation?

I’ve seen some code examples using a function called F(), like in:

Serial.print(F(“Hello”));

I couldn’t find any documentation or reference to this, though.
What does this function do?

Thanks
André

There is no documentation for that here since it’s not needed in the Particle world.
This is a mere legacy macro for compatibility with Arduino code.
On Particle it is transparent/vanishing

#define F(x) x

If you want to know what this is supposed to do on the Arduino side, here is a forum thread that addresses that
https://forum.arduino.cc/index.php?topic=91314.0

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