Small addendum to kelrin's writeup: As in telegraphy, "fist" is used in amateur radio jargon to refer to a CW operator's transmitting style, or to refer to an operator's ability to transmit CW with skill and clarity. An operator who sends well-formed dits and dahs, properly spaces characters, and makes a minimum number of errors is said to have a good fist; an operator who is clumsy in timing dits and dahs or who makes lots of errors is said to have a sloppy fist. (I swear I am not making this up.)