S: (n) tab key, tab (the key on a typewriter or a word processor that causes a tabulation)
S: (n) tab (a short strip of material attached to or projecting from something in order to facilitate opening or identifying or handling it) "pull the tab to open the can"; "files with a red tab will be stored separately"; "the collar has a tab with a button hole"; "the filing cards were organized by cards having indexed tabs"