What is this component?

I’m studying the Mega2650 scheme and I actually am not familiar with one component that is used a few times in the scheme. I’ve attached a picture. It is labeled RESET-EN. Thanks!

two parallel red lines ? = 100nano farad cap.

the half moons ? a jump point. . should be pads on the board with nothing connected. could call them user choice ?

you can connect a jumper, or a remote switch, additional cap...

It's a solder jumper. It's not actually a component,just a pair of pads on the PCB.