D (EN)

letter, noun, numeral, symbol

letter “D”

1. the uppercase form of the letter "d"
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   The name "David" starts with the letters "D".

noun “D”

1. a grade that indicates performance better than failure but worse than C
   Despite studying hard, she received a D in math, barely passing the course.
2. in US politics, a shorthand for a member of the Democratic Party from a specific location
   The senator, identified as D-California, spoke passionately about climate change.
3. the setting on an automatic transmission that allows the vehicle to move forward
   Before you start moving, make sure the car is in D.
4. a euphemism for "dick" (a slang term for the male genitalia)
   He's been bragging that she's totally into him for the D.
5. Deutsch number (a reference to a work by Schubert)
   Schubert's "Ave Maria" is listed as D. 839 in the thematic catalogue.

numeral “D”

1. the number five hundred in Roman numerals
   The number 650 in Roman numerals is DCL.

symbol “D”

1. the symbol for deuterium, a heavier isotope of hydrogen
   Water containing deuterium is often referred to as D2O instead of H2O.
2. the hexadecimal representation of the number 13
   0x0D represents the number 13 in hexadecimal notation.
3. the international vehicle registration code for Germany
   On the back of the car, there was a sticker with the letter "D", indicating it was registered in Germany.
4. the symbol for aspartic acid in biochemistry
   In the protein sequence MKTVDGKLMN, "D" stands for aspartic acid, an amino acid important for enzyme activity.
5. denier (a unit of measurement for the thickness of fibers)
   The silk stockings were made of 100D fiber, making them quite durable and sheer.
6. a size indicator for a specific volume of a bra cup
   She realized she had been wearing the wrong bra size for years and needed a D cup instead.