[Bloody] {Awful} (Punctuation)

[Square brackets] are used around some attributes, like [CmdletBinding()], and around data types like [string], and to indicate arrays - as in [string[]]. They pop up a few other places, too.

If your keyboard had a few dozen more buttons, PowerShell probably wouldn’t have had to have all these overlapping uses of punctuation. But it does. At this point, they’re pretty much just part of the shell’s “cost of entry,” and you’ll have to get used to them.