The most recent version of this documentation can be found at https://docs.dyalog.com/20.0/.
Monadic Right Arrow means
Syntax: Branch (Clear suspension)
→ Label ⍝ branch to Label:
→ ⎕LC ⍝ resume suspended execution
→ 0 ⍝ exit current function and resume calling line
→ ⍝ clear one stack suspension
Branching is superseded by the more modern
control structures such as :If ... :EndIf