Hello, I have a basic question regarding the formula on Ordinary Least Squares 
1.1.1. from this page:


scikit-learn.org/stable/modules/linear_model.html

The formula is the following: min (sub w) || Xw - y|| sub 2 super 2

I understand that we are trying to choose w to minimize the residual sum of 
squares xw-y.  

I don't understand what the subscript 2 (following the absolute value symbol) 
refers to.  


Thank you.

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