[pxndxx]

That line refers to the 'u' substituting for 'μ', the greek letter mu, not the L symbol. https://www.nayuki.io/page/common-mistakes-when-using-the-me...

[djtango]

I've always thought u for mu was a neat hack - its inconvenient to type mu and u is ascii compliant.

It usually doesn't take toooo long to figure out what u means from the context

[yuye]

I agree with u being a neat hack, don't agree with µ being hard to type.

On US-international keyboards, it's AltGr+m