What are the alphabets that have both rotational and reflection symmetry

Rotational symmetry -  A figure has a rotational symmetry, if its image, after a rotation of less than 360 degrees appears exactly the same as that of the original figure

The alphabets that satisfy this are 

H, I , O, X

Of the above letters, each has reflection symmetry, along both the horizontal and vertical axis as these look the same when reflected on either side of the horizontal or vertical axis as shown


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