+**D** is the fourth letter in the [Latin alphabet](/wiki/Latin_alphabet), a fundamental character across numerous languages. It signifies various concepts, from a [musical note](/wiki/Musical_note) to a Roman numeral representing 500. This versatile symbol underpins diverse systems of communication and measurement.
+## See also
+- [Alphabet](/wiki/Alphabet)
+- [Letter](/wiki/Letter)
+- [Roman Numeral](/wiki/Roman_Numeral)
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