Lien

Lien (pronounced Lee-in) is a type of currency used in Remnant. It is unknown if this is a universally-used currency, or if it only has worth within the kingdom of Vale.

Appearance
Lien has been seen on two occasions in the form of a plastic card with a black magnetic reader strip on the back and a small notation on the front. Each card has a specific color. The Lien symbol is an L crossed with two horizontal lines similar to some real world currencies such as Yen and Euros.

Ruby Rose
When Roman Torchwick and his Henchmen rob From Dust Till Dawn, the shop owner offers to give him all of his Lien. Roman refuses, instead ordering his henchmen to steal the store's entire supply of Dust.

Jaunedice
When Nora Valkyrie is recounting her dream, she mentions making Lien by selling rugs made of Ursa skin.

Best Day Ever
Emerald Sustrai offers Mercury Black some money that she pick-pocketed in return for him shutting up, but he declines her offer.

Round One
Emerald pickpockets Ruby Rose's wallet, filled with Lien, only to return it to her claiming that she found it.

New Challengers...
Qrow Branwen gives four Lien cards to the bartender at the Crow Bar.

Beginning of the End
Mercury presents Adam Taurus with a briefcase full of Lien.

Trivia

 * In the episode "Ruby Rose", when his men are defeated, Roman sarcastically remarks that they were "[truly] worth every cent." This could indicate that cents are a smaller denomination of Lien.
 * In the real world, a "lien" refers to a number of types of legal instrument which allow a creditor certain rights to a debtor's collateral property, should they fail to meet the obligations of a loan contract.