What is shape with longest name?

The shape with the longest name is a hexacontakaihexagon, which has 66 sides and angles. The prefix "hexaconta" comes from the Greek word for 60, while "hexagon" refers to a shape with six sides. The name can also be written as a hyphenated form, "hexaconta-kai-hexagon". This shape is not commonly used in mathematics and is mostly used in word games or puzzles.