Deutsche Gebärdensprache
German Sign Language uses a one-handed manual alphabet ('Fingeralphabet' in German) derived from the French manual alphabet of the 18th century; it is related to manual alphabets used across Europe and in North America. It differs from the ASL manual alphabet in the shape of the letter T and in the addition of a letter SCH (a 'five' hand). The additional letters for Ä Ö Ü and ß are formed by moving the letters for A O U S a short distance downwards.