This probably has been asked a bunch of times but I couldn't find anything with image search.
The component is designated as R1 and the only other piece of info is 500mA written on top of it. It is placed right after the power input. Due to the position I thought it was either a fuse or a ferrite bead, but as far as I can tell this is not a standard symbol for either.
Any help?
EDIT
The schematic is the ReSpeaker Raspberry Pi hat from seeed:
https://files.seeedstudio.com/wiki/ReSpeaker-4-Mic-Array-for-Raspberry-Pi/src/ReSpeaker%204-Mic%20Array%20for%20Raspberry%20Pi%20%20v1.0.pdf
The current flows to a reverse polarity protection circuit and a stack of LEDs afterwards.
Best Answer
I've not seen that symbol before. My best guess is that someone or something got messed up in the library (Altium/Eagle/whatever) and it's been drawn incorrectly.
Since it's on a voltage input and specifies a current amount, it's most likely a fuse. Because it's designated as a resistor, it may well be a resettable fuse, such as a PTC.
Here are some similar symbols for fuses. It may be that the symbol you show is a badly drawn version of one of these:
(Source)