There is something called the "Bristol Stool Chart" which we use sometimes in the office when dealing with patient's GI health (e.g. constipation). This chart gives a good idea of what the ...

Although we know that it's not always surefire way to diagnose a GI issue (e.g. having a Type 2 poop doesn't always mean you're suffering from constipation), the chart remains pretty much omnipresent.