Riddle

What can double in number, but is still singular?

Choose an answer

A.The letter O
B.The letter S
C.The letter I
D.The letter U
Hint: It's a 3-word phrase with 10 letters, starting with "T".

Answer

The letter U

Why this is the answer

Doubling the letter "u" gives "uu," which is exactly how the letter "W" got its name, "double-u," while U itself remains a single letter.

This riddle is filed under How, What, Why Riddles and rated Hard.