it means to add something a puctuation to both up and down
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The latin alphabet for English has 52 letters, if you count both upper case and lower case. Otherwise, there no other alphabet with 52 letters.
clxv*x = mdcl (165*10 = 1650) but in upper case letters although they both mean the same.
Presumably this is in reference to upper case Roman numerals rather than lower case numerals. For example: MMVIII (upper case) and mmviii (lower case) but they both have the same numerical value of 2008.
Lower case "o" and "x" both have two lines of symmetry. Upper case letters with two lines of symmetry are: "O," "X," "H" and "I."
The letters: I O H X o x all exhibit bilateral symmetry and rotational symmetry, with O and X exhibiting it in both upper and lower case.