In addition to Mathias answer.
Although not mentioned in OP, if you also need to see the Powershell specific/related internal variables, you need to use Get-Variable
:
$ Get-Variable
Name Value
---- -----
$ name
? True
^ gci
args {}
ChocolateyTabSettings @{AllCommands=False}
ConfirmPreference High
DebugPreference SilentlyContinue
EnabledExperimentalFeatures {}
Error {System.Management.Automation.ParseException: At line:1 char:1...
ErrorActionPreference Continue
ErrorView NormalView
ExecutionContext System.Management.Automation.EngineIntrinsics
false False
FormatEnumerationLimit 4
...
These also include stuff you may have set in your profile startup script.