If you are interested in a free Lean Six Sigma certification (the "White Belt") head on over to https://www.sixsigmasociety.org/ ... Before we can improve a process, we need to first understand it. Process flow charts help us with that understanding. They show the sequence of process steps. Here are some common symbols that we could use on our process map:

Rectangle – activity
Diamond – decision
Ellipse – start/end
Arrow – directional flow
Circle – connector (onpage)
Pentagon – connector (offpage)
Rectangle with Curved Bottom – a document
Rectangle with Interior Vertical Lines – a predefined process