It depends upon the pyramid:
if it is a right rectangular pyramid it will have one axis of rotational symmetry which runs from the apex to the centre of the base and a rotational symmetry of 2.
If it is not a right rectangular pyramid then there is no axis of rotation which will permit the pyramid to fit on itself before a complete rotation of 360°
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A rectangular pyramid has one axis of rotational symmetry. This axis passes through the apex (top vertex) of the pyramid and the center of the base. Rotating the pyramid around this axis by 360 degrees will bring it back to its original position, making it a symmetry axis.
Oh, dude, a rectangular pyramid has only one axis of rotational symmetry. It's like the Beyoncé of rotational symmetry - flawless from every angle but only spins like a singular diva. So, yeah, just one axis to rule them all.
The line joining the apex to the centre of the square base of a right pyramid is an axis of symmetry. Not sure what the other three are!
a rectangle has 2 axes of symmetry
A rectangle has 2 axes of symmetry.
It has 5 axes of symmetry
An isosceles triangle definitely has three axes of symmetry