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?
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.