D

What does "Delta" mean?

In the NATO phonetic alphabet, the letter D is represented by the codeword Delta, pronounced DELL-tah. When spelling over radio, phone, or in person in noisy environments, you say "Delta" to unambiguously indicate the letter D.

History & etymology

The fourth letter of the Greek alphabet, shaped as a triangle — universally recognizable.

How to use it

Say "Delta" whenever you need to specify the letter D aloud. Common situations: dictating an email address or license plate over the phone, reading a serial number to technical support, making a radio call in aviation or maritime contexts, or simply avoiding the common confusion between similar-sounding letters (B/D/P/T, M/N, F/S).

Example

If your name starts with D, you might say "Delta as in Delta" when spelling it out — or use the NATO alphabet for your whole name using our translator.

Neighboring letters

Explore the codewords for the letters before and after D below. For the full 26-letter chart with pronunciation and history, visit the NATO alphabet reference page. Prefer to memorize it? Try our flashcards.