Nautical Flag Signals of the International Code of Signals

The International Code of Signals is a unique system of communication that uses flags and its combinations to send specific messages like warning, the state of the vessel, a request, or even distress signal.
Here, we will also decode the meaning behind each flag signal for every letter of the alphabet from A to Z or Alfa to Zulu! Not only will you see the flags, but we'll also unveil their corresponding Morse code sounds for ultimate maritime communication mastery.
At the end of this video is a short quiz designed to gauge your understanding of these maritime flags and the Morse signal in audio format using the soothing beeps of the telegraph key.
Let's go!

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I am confused, because there are others that says that the ROMEO flag has meaning, yet I don't know which is the real one.