is an 'arm' inside a typewriter
with a character
on the end of it. There are generally two characters per typebar, one which will be printed if the corresponding key is struck by itself, the other of which will be printed if the corresponding key is struck while the shift key
is depressed. To have letters typed in exact location, the typebar was guided all its way till the ribbon through its narrow gap in segment
Prior to the advent of the electronic typewriter, the typebars would often jam when two or more keys were depressed simultaneously (see picture). Such jamming led to the creation of the QWERTY keyboard.