Homonym: d (Note)
The letter "d" is the fourth letter of the English alphabet. It is a consonant and is pronounced as /diː/. In the English language, "d" can represent various sounds, often found at the beginning of words like dog or in the middle of words like ladder.
In mathematics, "d" is commonly used to denote a variable or dimension, such as in geometry where it can represent distance. Additionally, in music, "D" refers to a specific note in the musical scale, which is the second note in the C major scale.