keyboard • Another word for finger, sormi, is näppi, näpit. When you do something where you touch something with multiple fingers consecutively, for example twang guitar strings, that can be called näppäillä, näppäily. Ending -sto, -stö indicates something that is formed of many same items in same place, for example puu, puusto means a place with trees. Keyboard has multiple keys handled by one finger at a time, so it's called näppäimistö.