Symbol.prototype.description

console.log(Symbol("desc").description);
// : "desc"

console.log(Symbol.iterator.description);
// : "Symbol.iterator"

console.log(Symbol.for("foo").description);
// : "foo"

console.log(`${Symbol("foo").description}bar`);
// : "foobar"

Symbol("desc").toString(); // "Symbol(desc)"
Symbol("desc").description; // "desc"
Symbol("").description; // ""
Symbol().description; // undefined

// well-known symbols
Symbol.iterator.toString(); // "Symbol(Symbol.iterator)"
Symbol.iterator.description; // "Symbol.iterator"

// global symbols
Symbol.for("foo").toString(); // "Symbol(foo)"
Symbol.for("foo").description; // "foo"