Hey, On the back of the circuit boards in most electronics there are labels for the parts. I know a few of them: R - Resistor C - Capacitor L - Inductor D - Diode Q - Transistor (Is this all transistors or just BJTs?) U - Integrated Circuits However, there are some that I don't recognize. The particular one I am looking at is labeled M1 on the board, but there is an F0 (either that or E0) on the component (see the picture). We used M for MOSFETs in my EE classes but I am pretty certain that it isn't a MOSFET. I thought this might be a fuse, but I'm not sure. Thanks In Advance! Also, if there is a link with the component labels, I would appreciate the resource.