At one level of perception there is just coincidence.
https://unhypnotize.com/september-11th-attacks-911-/81984-did-band-supertramp-predict-911-thier-breakfast-america-album-cover.html
Of course there is plenty of coincidence in the world. However, when some coincidence is perceived to have a higher or deeper connection, its considered to be synchronicity.
Synchronicity has a light and dark side or a positive and negative flow.
Light and darkness is part of the universe just like +&- are.
Religions and mythologies are partially about contemplating the light and darkness of possibilities.
Synchronicity & Symbolism:
9-11 & 9/11
