I do this when writing λ, Δ, Φ, etc. in a document on a computer I don’t own or when on my phone. It’s genuinely faster than scrolling through Word’s symbol list, for example.

You mean \lambda, \Delta and \Phi?

Not all of us are able to use superior tools like LaTeX for our documents, unfortunately

You mean L^A^T~E~X?

(Btw for the uninitiated: The x is a chi, pronounced as in Koine/Modern Greek, like in British “hue”, first make sure it’s a “hj” and then squeeze it even tighter. At least according to Knuth it’s a chi, that is.)