The `NOT` operator is represented by an exclamation mark `!` in JavaScript. It takes a single operand and inverts its value. If the operand is true, then `NOT` will make it false, and if the operand is false, then `NOT` will make it true.

Here's an example:

```javascript
const isRaining = true;
const isNotRaining = !isRaining;

console.log(isNotRaining); // false
```

In the code above, the `isNotRaining` variable is assigned the opposite value of the `isRaining` variable. Since `isRaining` is `true`, `isNotRaining` is assigned `false`.

```javascript
const isRaining = false;
const isTooHot = true;

const canGoOutside = !isRaining || !isTooHot;

console.log(canGoOutside); // true
```

In the code above, the `canGoOutside` variable is assigned `true` if it is not raining or if it is not too hot. Since `isRaining` is `false` and `isTooHot` is `true`, `canGoOutside` is assigned `true`.

---

In the exercise below, select all the options that evaluate to `true`.

```javascript
const isRaining = true;
```

NOT Operator