So sorry to hear you're going through this. Pain in the left arm and the back is always concerning, in terms of whether it could be heart related...
There are several different foods that start with the letter L! Here are some: Lamb chops, Lasagna, Lettuce, Lays Potato Chips, Lamb, Legumes, Lima beans, Linguine, Laffy Taffy, Lollipops, leeks, lemon, lime, Linzer tarts, Lindt chocolate, Liquorice, lychee berries, lentils, lucky charms, luna bars, liver, lard, liverwurst and Lean Pockets.
The letter K indicates that the food is Kosher-that is, it also complies with Jewish dietary laws and has been processed under the direction of a rabbi. The Hebrew word Kosher means permitted according to Torah Law. When you see these letters, they mean that the product does not contain anything from an animal or pork origin. But it still may contain alcohol. So please check labels. It is recommended, however, to read labels before buying food products. Read the ingredients on the food labels and understand the meaning of every ingredient.