RocketLink is a syntax for hyperlinks that originated in GemText. The idea is that the whole line starting with a ⇒ is a link. Text before the first whitespace is URL’s destination. Optional text after the first whitespace is what is displayed instead of the address.

Used in Phoebe (of course, it uses GemText) and in MycorrhizaWiki (it no longer uses GemText but still uses rocket links).