U (EN)

letter, noun, preposition, symbol

letter “U”

1. the uppercase form of the letter "u"
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   In the name "Ulysses", the letter "U" is capitalized.

noun “U”

1. short for "U-turn" (a maneuver in which a vehicle reverses direction)
   After missing the exit, he realized he had to make a quick U to get back on the right track.
2. abbreviation for "university"
   She's planning to apply to the U. of Texas next year.
3. abbreviation of Sunday
   There are no classes scheduled for F S U and M.

preposition “U”

1. abbreviation of "under" in sports (a category or level in sports based on age)
   He was selected for the U21 national football team last summer.

symbol “U”

1. symbol for uranium (the element with the atomic number 92)
   U-235 is a highly sought-after isotope of uranium for nuclear reactors.
2. 1-letter symbol for uracil (a component of RNA)
   In the RNA sequence AUGC, the "U" stands for uracil.
3. symbol for voltage in physics
   To calculate the electric power, use the formula P = U * I.
4. the symbol for the uniform distribution in statistics
   To model the probability of rolling any number on a fair six-sided die, we can use the U(1,6) uniform distribution.
5. the symbol for the unitary group (a set of complex matrices that preserve length)
   In our quantum mechanics class, we learned that U(2) represents the unitary group of 2x2 matrices.