Which one is correct?
"an sos" or "a sos"?

an sos

This is correct. 'An SOS' is more appropriate because the pronunciation of the acronym starts with a vowel sound.

Use 'an SOS' when referring to the distress signal. The choice of 'an' is based on the pronunciation of the acronym, not the actual letter.

Examples:

  • Please send an SOS signal immediately.
  • An SOS call was received from the stranded hikers.
  • The ship sent an SOS message before it sank.
  • An SOS was heard over the radio.
  • The pilot transmitted an SOS to indicate an emergency.

Alternatives:

  • a distress signal
  • a call for help
  • a plea for assistance
  • a distress message
  • a signal of distress

a sos

This is correct. 'A SOS' is also commonly used, but 'an SOS' is more appropriate due to the pronunciation of the acronym.

While 'a SOS' is used by some speakers, 'an SOS' is more widely accepted. Stick to 'an SOS' for formal or correct usage.

Examples:

  • The ship sent a SOS signal before it sank.
  • A SOS call was received from the stranded hikers.
  • Please send a SOS message immediately.
  • A SOS was heard over the radio.
  • The pilot transmitted a SOS to indicate an emergency.

Alternatives:

  • a distress signal
  • a call for help
  • a plea for assistance
  • a distress message
  • a signal of distress
Both 'an SOS' and 'a SOS' are commonly used, but 'an SOS' is more correct because the pronunciation of the acronym starts with a vowel sound. The choice between 'a' and 'an' depends on the sound that follows, not the actual letter.

Last Updated: March 19, 2024

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