A L shortcut for the Lexeme namespace would be useful, just like the P shortcut for Property, so that you can use [[L:L123]] to link to a lexeme just like you can use [[P:P123]] to link to a property. This was suggested by @revi on Wikidata talk:Lexicographical data#Template:L.
For reference, the task for the “P” alias was T47079, and it was added in I480fa8e66b.
This should also work when searching, e.g. Special:Search/l: test as Special:Search/p: test.