* 1s¹

Let's break it down:

* 1: Indicates the principal quantum number (energy level). Hydrogen has only one energy level.

* s: Indicates the type of orbital, which is a spherical orbital.

* ¹: Indicates the number of electrons in the 's' orbital. Hydrogen has only one electron.

Visual Representation:

You can think of it like this:

```

1s

↑

```

The arrow represents the single electron in the '1s' orbital.