Marked NSFW and replaced the thumbnail in case someone’s eating and doesn’t want to see an illustrated poop chart. At least it doesn’t include photos.

The Bristol stool scale is a diagnostic medical tool designed to classify the form of human faeces into seven categories. It is used in both clinical and experimental fields.

It was developed at the Bristol Royal Infirmary as a clinical assessment tool in 1997, by Stephen Lewis and Ken Heaton…

Also:

…6 and 7 indicate diarrhea.