Unknown symbol : Arduino Uno Schematic

Hi guyz, I’m going through the arduino schematic and found an unknown symbol. Can you guyz please help me to identify what it is?

Compare them to the actual board and see what you find there?

It did not show up on the periodic table of components

Those are Solder Jumper pads. They often have a trace on the board connecting them for the default condition. You can cut the trace, then blob solder across the two pads at a later time to make the connection again.