Mac users often record keyboard shortcuts like "⌘ + ⌥ + ⌫" but PC users write Ctrl + Alt + Del whatever... Emacs users have a notation of their own.
No single keyboard cheat sheet (which could save screen/paper space this way), nor even an actual keyboard I've ever seen had ISO 9995-7 key symbols - everybody just uses the names.
Why is this?
Blackboard: λ > lambda
ASCII: lambda > λ
More power to you if you want to include the graphically elegant glyphs in your final drafts. S/o to (La)TeX for being a bridge here.