PSByPassCLM
Bypass for PowerShell Constrained Language Mode.
This technique might come in handy wherever or whenever you're stuck in a low privilege PS console and PowerShell Version 2 engine is not available to perform a PowerShell Downgrade Attacks.
What described above may happen in [modern] Windows OSes (like Windows 10, Windows Server 2016..), that nowdays are shipped out with AppLocker and PowerShell Version 5.
With AppLocker in Allow mode and PowerShell running in Constrained Mode, it is not possible for an attacker to change the PowerShell language mode to full in order to run attack tools.