This I found interesting
"According to Indian mythology, there are 4 Yugs
Satyug - consists of 172,800 years (1+7+2+8) = 18 = (1+8 = 9)
TretaYug consists of 1296000 years (1+2+9+6) = 18 = (1+8 = 9)
DwaparYug consists of 864000 years (8+4+6) = 18 = (1+8 = 9)
Kaliyug consists of 432000 years (4+3+2) = 9
8. In Hinduism, Rishi Vyas created 9 Purans, 108 MahaPuran (Upnishads). Mahabharat has 18 chapters, Geeta has 18 chapters, Bhagavat has 108000 verses. The sum of individual digits of each of these numbers is 9. That link didn't mention the Baha'i Faith. It's mostly just grade school Math.
9. Our festival "Nava Rathri" literally means, and is practically celebrated for, 9 nights, and it signifies the 9 forms of the Goddess.
In the Baha'i Faith Baha, the name of Baha'u'llah totals 9
Source -
The Endless Chasm: The Amazing Number Nine...
Regards Tony