The answer depends on the character set, the case as well as the font. For the upper case for the Roman alphabet and taking the simplest form, they are:H, O and X.
Seven
o x l I
H, I, O, X. Of course, it may depend on the font.
Five.H , I , O , X( ' O ' has 2 lines of symmetry and more besides and ' X ' has 4 )
the answer is U O S H K Z X N A D=2 0R MORE LINES OF SYMMETRY
None. Some letters have one or more but all the letters, taken as a set, have none.
H And if you wanted to spend a few more seconds thinking about it, you might also want to include B, C, D, E, I, K, O, S, X
H, I, N, S, X and Z. I make that 6, not 3! And O has 180 degree symmetry and more!
a square can have 4 lines of symmetry or more
A regular hexagon has more than 4 lines of symmetry. Even number sided polygons that are regular and have more than 4 sides have more than 4 lines of symmetry. Circles have more than four lines of symmetry. Squares also have 4 lines of symmetry.
Of the capital letters M, O, E, and X, -- M and E each have one line of symmetry, -- X has two lines of symmetry, or four if the cross lines were printed perpendicular, as they are in some fonts, -- O has an infinite number of lines of symmetry. My answer is justified by my firm conviction that it's correct.
An isosceles triangle has 1 lines of symmetry whereas a rhombus has 2; thus the rhombus has more lines of symmetry.