Notice 3 amigos,

Notice 3 blind mice,

Notice 3 musketeers.

Notice 9 comes before 10

And 19 comes before 20.

Finally, notice 6 is just past the middle but also accepting of what it has already passed and doesn't look back. Six loves what is to come. Six looks forward eagerly, 6 has absorbed 1 - 5

In numerology the 3 represents creativity

The 6 represent love and the 9 represents completion

3 represents the original Trinity mother father and child. 6 represents our 6 protons 6 electrons and 6 neutrons which make up an atom. 9 represents us as 9 ether beings 6+6+6=18 (9) 9 also represents us 9 months in the womb

That is not everything about those key numbers