A Sumerian pictograph from about 3500 BC shows one; the oldest known are solid wooden disks made of three planks. What is it?

Which word for a WWII suicide pilot was the winning word of the 1993 National Spelling Bee? On a boat, a "suit" is a complete set of what? Which playing card suit is represented by a trefoil, a three-leafed symbol? Which word names both a sulky, petulant person and a breed of pigeon? What is a summary list of legal cases scheduled to be heard in court called? Who painted "A Sunday Afternoon on the Island of La Grande Jatte"? What is a strict vegetarian who avoids all animal products, including eggs and dairy, called? A superfluous or unwanted person is said to be a fifth what?