Open your backpack and each weapon has a border with either white, green, blue, purple, pink/magenta, or orange. Orange is the legendary. --- Sticks and stones may break my bones but words will send me into a downward spiral of infinite despair.
Firehawk shield you get from sidequests from Lilith is a legendary. If you have it, take a look and notice the orange-ness of the item. That is Legendary. --- not changing my sig until Shenmue 3 is officially announced.