Notation for Byobu Keybinding Files

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http://askubuntu.com – Does anyone know what notation is used to represent keyboard keys in Byobu's keybinding files (f-keys.screen etc)? I know what keys I would like to change and have poured through the file trying to figure out which keys are represented by the notation you use but I can't decypher the compound structure for some of them. It looks like there are several symbols used for some commands and that is throwing me for a loop. (HowTos)