I may be outdated, but when I was in school we called that a line segment. I am assuming u mean a straight line. If it is a circle or other curved line, it is called an arc.
In the case of upper case letters in the Roman alphabet, and allowing tine segments of lines that are curved, they are: B, C, D, E, F, G, H, M, N, O, P, Q, R, S, U, Z.
Capital letters or big letters. ex. A G L U E The opposite of lowercase letters. (a g l u e )
A, b, c, d, g, j, k, l, o, p, q, r, s, t, u, v, x, y
you can make you,no,cab,cat,train,rack
The letters that have no angles are O, C, G, and S. These letters are considered to be circular or curvilinear in shape, lacking any straight lines or sharp corners. The absence of angles in these letters distinguishes them from angular letters such as L, T, and Z.
no j is a consonant a e i o u are vowels
Jaguar Ulysses Butterfly
C,o,s,u
haji
jurants
B, J, O, U, and Y
cajole
B, J, O,U, And Y
u g y h j
You can spell many, many, many words with those letters.
In De Argumentis Scientiarum (1623), Francis Bacon states “much more twenty-four, which is the number of letters in our alphabet,” after which in an enumeration he indicates that those letters do not include the modern “j” & “u,” while “w” is listed.