Or perfection, but good find Ping-Pong!
Good morning, I hope I was correct in assuming you were interested in the "spiritual significance of numbers", if not then the following will bore you to tears.
I discovered this a few years ago and couldn't believe it:
The # 9 means finality of judgment and is seen in all cases where judgment is the subject (or multiples of 3).
The # 11 denotes disorder, disorganization
A perfect description of the horrific event of 9/11.
Then go to Revelation 9:11. (Those same numbers again):
"And they had a king over them, which is the angel of
the bottomless pit, whose name in the Hebrew tongue is
Abaddon, but in the Greek tongue hath his name
Apollyon."
God telling us who the leader of the 9/11 attacks were - Satan, and to cut through any confusion, giving his name in 2 languages.
Since becoming aware of this numbers game I find that God left many of His thumbprints on scripture like the above. It is so awesome to see His handiwork laid out long, long ago for us to discover today. Before 2001 the 9:11 verse really wouldn't have had that same meaning.