1. U is the 21st letter in the Latin alphabet. The letter U is derived from the letter V. U is written differently and has different meanings. The details are as follows:

2. The capital U represents the meaning:

In chemistry, it is the chemical symbol for the element uranium;

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In computer science, a U is the height of a chassis, which is 44 millimeters or 1.75 inches.

In physics, it represents the symbol of electric potential;

In mathematics, U represents union, and the flipped U represents intersection. It is both an operator and a set.

3. The lowercase u represents: atomic mass unit; the International Phonetic Alphabet is a closed back rounded sound.