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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Symbol/description below:

Symbol.prototype.description - JavaScript | MDN

Baseline Widely available

description 是一个只读属性，它会返回 Symbol 对象的可选描述的字符串。

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

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

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

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

Symbol('myDescription').description;
Symbol.iterator.description;
Symbol.for('foo').description;

Symbol 对象可以通过一个可选的描述创建，可用于调试，但不能用于访问 symbol 本身。Symbol.prototype.description 属性可以用于读取该描述。与 Symbol.prototype.toString() 不同的是它不会包含 "Symbol()" 的字符串。具体请看实例。

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

// 内置通用（well-known）symbol
Symbol.iterator.toString(); // "Symbol(Symbol.iterator)"
Symbol.iterator.description; // "Symbol.iterator"

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

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