You can get rid of it by holding down on the command or key on the keyboard and dragging it off the menu bar.
are you by chance using an older apple keyboard hooked up to your mac? the older keyboards didnt have eject buttons, so when you hook up older style keyboards the only way to eject is through the computer itself. i learned this with my mac mini. took me a while to figure out when i saw it too.
yep that will do it!