...the symbol that looks like a side view of an escalator going down and has a dash next to the top of it? I can't get a picture of it, but, for example, the show/hide equalizer in iTunes uses it. Thanks.
Apple commonly uses the symbol ⌥ (U+2325, 8997 in decimal) to represent the option key. This symbol, originating on the Apple Lisa, represented the pull-out plastic card situated under the Lisa keyboard.