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.
How to Substitute Flour for Bread Flour. The more protein a flour contains, the higher its gluten content, as the protein helps gluten develop during the bread-making process. Using a flour with less protein, such as all-purpose flour, in place of a flour with higher protein, such as bread flour, affects the texture and quality of your baked good. High-gluten bread flour helps breads develop structure and texture.