No shape, its impossible for a shape to have 0 sides because even a line has 1 side.
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It can't exist, but if some stupid reality paradox happened in some 2D universe then I have some names.
Midegon/Midengon
Oudenogon
Nihilogon
Nilogon
a line
a circle
A 0-sided shape is called a circle. Yes, I know it sounds like a trick question, but a circle technically has 0 sides because it's defined by its curved boundary. So, there you have it, a shape with no sides but still manages to be round and fabulous.
A crescent has two [curved] sides and two corners.
a shape with equal sides