It would be incredibly naïve to believe that an eszett (ß) is a "lowercase beta." And mu? That's µ! Not even similar! The eszett, or Scharfes S (Sharp S), originated as a ligature or the letters S and Z. Modernly, however, it is used as a double-S, which, in certain words, replaces the S's. Because of technical restrictions on non-German or Apple keyboards, two S's are often used instead.
It would be incredibly naïve to believe that an eszett (ß) is a "lowercase beta." And mu? That's µ! Not even similar! The eszett, or Scharfes S (Sharp S), originated as a ligature or the letters S and Z. Modernly, however, it is used as a double-S, which, in certain words, replaces the S's. Because of technical restrictions on non-German or Apple keyboards, two S's are often used instead.