Are there any other uses of parenthesis in powershell?

Question

As new to Powershell world, sometime I'm stuck in the tricky syntax. That's why I'm trying to figure out all the possible uses of the parenthesis inside the language.

Do you know some more? Can you add here?

Here mine (left out basic use of curly in pipeline and round in method calls):

# empty array
$myarray = @()

# empty hash
$myhash = @{}

# empty script block
$myscript = {}

# variables with special characters
${very strange variable @ stack !! overflow ??}="just an example"

# Single statement expressions
(ls -filter $home\bin\*.ps1).length

# Multi-statement expressions inside strings
"Processes: $($p = “a*”; get-process $p )"

# Multi statement array expression
@( ls c:\; ls d:\)

Answer 1

Cause a statement to yield a result in an expression:

($x=3) + 5   # yields 8

Answer 2

When using generics, you need to wrap the type in [..]:

New-Object Collections.Generic.LinkedList[string]

For some people this might look confusing, because it is similar to indexing in arrays.