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S

Sierra

see-AIR-rah

NATO code word for the letter S

Quick Facts

Pronunciation

see-AIR-rah

Morse Code

···

Signal Flag

Maritime S

Visual Signals

Maritime Signal Flag

Sierra maritime flag

International maritime signal flag for S. Used in naval communications and ship-to-ship signaling.

Semaphore Position

Sierra semaphore signal

Semaphore flag position for S. Used for visual flag signaling over short distances.

About Sierra

Sierra is the NATO code for S, named after the Spanish word for mountain range.

Why "Sierra"?

From Spanish "sierra" (mountain range), internationally recognized.

Real-World Usage

  • 1

    Aviation: "Sierra approach, descend to FL250"

  • 2

    Military: "Sierra squad advancing"

  • 3

    Emergency: "Name: Sarah-Sierra-Johnson"

💡 Memory Trick

Sierra Nevada mountains - both S and N (Nevada) in alphabet

❌ Common Mistakes

Don't confuse Sierra with:

  • Sam
  • Sugar
  • Susan
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