Confusion in representation of Weight Matrix

What is represented by W[i,j]^[l]?
What i understood is that W[i,j]^[l] represents jth weight of ith neuron in lth layer.

But in MLP 03 video, it seems that W[2,1] represents weight of 2nd neuron in previous level to 1st neuron in lth layer

can u pls elaborate and send the snapshot of exact part of the video where u have doubt.