The pattern
SOS in Morse code is written as ... --- ...
The pattern is easy to remember because it is short, balanced, and visually symmetrical.
Why it became famous
SOS became widely recognized because it was simple to transmit and easy to identify.
Over time it became one of the most famous distress signals in the world.
How people use it now
Today people still recognize SOS in movies, learning materials, survival references, and puzzle-style communication.
It is often the first Morse pattern that beginners learn.