The answer depends on which letter.
o
N, S and Z.
"you" is a word, not a letter and it does not have rotational symmetry.
It has rotational symmetry of order 2.
yes, it has a rotational symmetry of 180 degrees, and of course 360. like if you flipped it upside down, then put it on top of the other one it would look the same. just not a lowercase.
what is the four letter DNA alphabet and what are the special rules by which the alphabet pieces bond together
1. the fourth letter of the Greek alphabet (Δ, δ). 2. the consonant sound represented by this letter. 3. the fourth in a series of items. 4. anything triangular, like the Greek capital delta (Δ). 5. Mathematics. an incremental change in a variable, as Δ or δ. 6. a nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular: the Nile delta. 7. (usually initial capital letter) a word used in communications to represent the letter D. 8. (initial capital letter) Astronomy. a star that is usually the fourth brightest of a constellation: The fourth brightest star in the Southern Cross is Delta Crucis.
H
There are 10 letters in the alphabet that achieve rotational symmetry when displayed in their capital form. These letters: A, H, I, M, O, U, V, W, X, and Y.
Yes, the capital letter N has rotational symmetry but no lines of symmetry:
S
letter o and x
None.
None.
No, but the spokes on a bicycle do.
None.
Two.
2
In the good old days (when I was at school and was taught about rotational symmetry) it had one, but the modern definition is to say it has none.