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I may be outdated, but when I was in school we called that a line segment.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 )
you can make you,no,cab,cat,train,rack
A, b, c, d, g, j, k, l, o, p, q, r, s, t, u, v, x, y
C,o,s,u
Jaguar Ulysses Butterfly
List: O Q Z J..............etc
u g y h j
cajole
B, J, O,U, And Y
jurants
B, J, O, U, and Y
haji
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.
AEFHIKLMNTVW XYZ BCDGJOPQRSU As you go down the alphabet you take out the letters that can not be formed by a straight lines and put them at the end. That is why the first group is has only straight lines and the last group has curved lines. If you separate them then they are still in alphabetical order.