This question is related to notation of infinite product.
We know that, $ \prod_{i=1}^{\infty}x_{i}=x_{1}x_{2}x_{3}\cdots $
How do I denote $ \cdots x_{3}x_{2}x_{1} ? $
One approach could be $ \prod_{i=\infty}^{1}x_{i}=\cdots x_{3}x_{2}x_{1} $
I need to use this expression in a bigger expression so I need a good notation for this. Thank you in advance for your help.