No idea what it was.

The Three Dots and a long bar - no one knows what that means now. Everyone knew what it meant then.

An exaggeration, perhaps, but the symbols were familiar, especially in the Victory context. Here, I'll help.

What's the first letter in Victory?

What's the Roman numeral for 5?

What's Morse code for V?

...-

How does Beethoven's 5th Symphony start?

And that's why people looked at this ad, and heard "da-da-da dummmmm."