I was walking in a nearby neighborhood and noticed the poster with the German Finger Spelling Alphabet in a window. If you look at the images in the lower, you will see that they include the three umlaut forms, ä, ö and ü; the ß; and my favorite, sch since this combination is such a common one. While searching online, I discovered that some systems also include a ch, an nn and an mm; plus my favorite, the sch.
Further searching revealed a Japanese Finger “Alphabet” which is more accurately termed a Finger Syllabery, as well as Russian, Greek and Norwegian varieties. With all of these you can let your fingers do the talking.
Earthquake Words/Erdbeben Wörter 