What is the phonetic term for the letter 'O'?

The phonetic term for the letter 'O' is "Oscar." In the context of the NATO phonetic alphabet, each letter is assigned a word to provide clarity in communication, especially in noisy environments or over radio transmissions. Using "Oscar" helps to eliminate confusion that could arise from mishearing the letter 'O,' which could be confused with letters like 'B' or 'D.'

While other choices like "Ontario," "Olivia," and "Oregon" may sound plausible, they are not part of the recognized phonetic alphabet. Using standardized phonetic terms like "Oscar" ensures effective and consistent communication across various fields, such as aviation and military operations, where precisely spelling names or codes is essential.