daisy wheel 
noun
A device used as a printer in some word processors, consisting of a disc of spokes each terminating in a printing character.When Jim gave me the responsibility for publishing the computer center newsletter, the first thing I did was order new daisy wheels that didn't slash the zeroes....
- This particular daisy wheel is from the 60s.
- A few computer programs and special-order daisy wheels are available to transform modern typewriters or word processors to the Dvorak keyboard, but the demand for these products is small.