A German ligature that originally stood for 'sz', but can be transliterated as 'ss'. It is never found in Swiss German. It looks like a B, but sounds like an S. Compare to the boring language known as English, which only has the ligatures Ã and Å, which are rarely used.
The only other flour used in traditional pumpernickel is wheat flour, which is used as an ingredient in the sourdough starter, a pre-fermented flour, water and yeast mixture that combines with the rye flour to hold the bread together.
Rye Bread. Because rye flour contains very little gluten, it is often combined with wheat flour to make bread. Gluten in the wheat flour allows the loaf to rise and become airy, as opposed to the flat, dense texture of 100% rye flour loaves. Rye bread can be made with light or dark rye flours.