Flowcharts.

The flowchart featured on the left hand side basically consists of a variety of steps needed to follow.
The oval which says start indicates the beginning of the process and shows where it starts and stops.
With this the parallelogram representing the process steps and says read temp, branches into the process even deeper directing us to decisions.
The diamond representing decisions, and saying temp <32 gives us two choices, yes and or no. The arrows represent the process flow direction and help us decide which action we want to proceed with.
After choosing either the first option or the second option, from the parallelogram, you are finally faced with your final destination. The end, which once again is in the shape of an oval representing the start or the end.