Bar Spoon

A bar spoon has an elongated handle with a twisted middle section.  These spoons have either a flat disk end or rounded end.  Both ends are effective for stirring cocktails, and the twisted middle section allows for faster action when stirring.  Also, the spoon measures roughly 5ml or 1.4 oz, so it is convenient for measuring small amounts.
 
When stirring drinks it is important to try and be as gentle with the ice as possible, since aggressive stirring will chip the ice and lead to overdilution of your drink.  Overdilution is the cardinal sin of bartending, and bar spoons make for good knuckle-rapping devices should you receive a drink that is more water than flavour.