Here are some of the sausages you will find in a grocery. At the bottom rack from right to left, Burenwurst, Debreziner, Knacker and Frankfurters. Notice that each is distinguished by their sizes and colors.
On the middle rack are whole hams; Jausenwurst, Krakauer, Pikantwurst, Extra, and Wiener. They are distinguished by their color casings (synthetic). And lastly on the top rack, are the cuts from the whole hams, in case one is in a hurry to eat. =)
Click photo to enlarge.