Oh, dude, you're hitting me with the tough ones. So, technically, a shape that starts with the letter Y would be a "yarn ball" if you squint hard enough and use your imagination. But like, let's be real, that's not a standard geometric shape or anything. So, yeah, there isn't really a common shape that starts with Y in the traditional sense.
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The shape that starts with the letter Y is a "yarnell," which is a geometric shape that resembles a star with ten points. This shape is not as commonly known as other shapes, such as triangles or squares, but it is a valid geometric form. The yarnell shape can be used in mathematical and artistic contexts for its unique design and symmetry.
Well, honey, the shape that starts with the letter Y is a "yoctagon." But let's be real, nobody actually uses that term. It's like trying to make fetch happen - it's just not going to work.