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Language-specific web editors often do. I think Uiua (https://www.uiua.org/) is the state of the art here, with the minor issue that most of the symbols aren't used in any other language. Several APL-likes have language bars at the top, with names shown on hover.

- Dyalog APL: https://tryapl.org/

- Kap: https://kapdemo.dhsdevelopments.com/clientweb2/

- ngn/apl: https://abrudz.github.io/ngn-apl/web/

- BQN (my language): https://bqn.funmaker.moe/

Dyalog APL's RIDE interface doesn't even need you to find the symbol on a language bar; just hover the mouse over it, and a tooltip appears: https://i.imgur.com/XtzRGUs.png

Although Dyalog APL is slightly different from other APLs, their editor does have exactly that in their REPL; it is a good way to learn the basics.