To align the Hyper-V with System Center VMM Microsoft has changed the Hyper-V manager regarding the snapshots to Checkpoints. I personally had preferred that they changed the naming in VMM to snapshots instead, but that is my opinion and maybe that is because of my background in VMware environments

Although the change has been implemented in the GUI, the PowerShell module has not been updated to reflect this as you can see in my next screendump:

The cmdlet to take a checkpoint is as it has been in the Hyper-V Powershell module in 2012, Checkpoint-VM.