The term 'Kind of Dollar' refers to different types of currency. The crossword solutions for this term are SAND (4 letters), Euro (4 letters), and Petro (5 letters). SAND is a type of currency used in the game Second Life, which is an online virtual world. The Euro is the official currency of the European Union and is used by 19 of its member states. Petro is a cryptocurrency created by the Venezuelan government as an alternative to the US dollar.