People would sometimes consider pirates to be searching for treasure commonly, and they would sometimes use 'booty' or loot as pirate speak slang, the treasures they would find were usually consisting of gold, magic objects, jewelry, and other various flashy objects.
"I treasure you more than anyone in the world"
"The treasure of lying underneath the full moon"
"Yarr, there be tha treasure up ahead, set full sail to that ther' cave!"
Scott(he's a dick):What are you idiots doing?
Terrance:We're looking for treasure.
Scott:Is that some kind of metaphor for a search that can't be described?
Phillip:No...We're searching for treasure.
Examples of Treasure's works include Gunstar Heroes, Radiant Silvergun, Sin and Punishment, and more recently, Ikaruga.
RG2: "Gunstar Heroes? What's that?"
RG1: "It's a run-and-gun shooter by Treasure. You know, kinda like Contra or Metal Slug."