River of a number

I have been searching this thing for two days . :( I cant even find it in google!
Please help me...
What is exactly the "RIVER OF A NUMBER" means?
I just want to noe the concept!
Is it something related with the digit root of a number.?
Please help!

--Life is amazing and wonderful more than ever before! --
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Cheers,
Tressy.

Yeah...Wake up!

The below images are part of a photo campaign by Traffic Police of Hyderabad. But this is relevant to all Indian cities for sure!

Wake Up! India ! …Follow the rules…Make the shift from Barbarian to Civilian way of life.