The right side of my sleeve is cover-up for an old eightball surrounded by flames. If you look close you can see parts of the old flames that were used for the Bio-Mech. Most people never see it until I tell them what used to be there.
Look morons; If you are referring to an article of clothing, then yes the arm is called the sleeve. If you are referring to a tattoo, anything that covers a particular part of ones body is called a sleeve. I don't get why everyone is so dumb about this...