What letters of the word POST OFFICE have one ad only one axis of symmetry?

In the Word "POST OFFICE," the letters that have only one axis of symmetry are "P," "S," and "F." The letter "P" has a vertical axis of symmetry, while "S" has a horizontal axis of symmetry. The letter "F" also has a vertical axis of symmetry, making them the only letters in the Word with this characteristic.