These are only really mysterious keys if you live in somewhere like the UK perhaps but my Triumph-Adler Tippa has some keys for use in German language typing. The extra language keys mostly use the keys often used for fractions on other typewriters. The typewriter also does not have a QWERTY layout as Z and Y have been swapped (so it is a QWERTZ typewriter instead!) It would be nice to add some more non-English typewriters to the collection.