I like the Raspberry Pi.
I have a couple of the mini Computer Boards and I like to run them remotely.
While I try to name the machines appropriately and I have changed the default passwords.
I sometimes need to check which board is which and what OS its running on.
To find out the Model of your Raspberry Pi Hardware
cat /proc/device-tree/model
To find out the version of OS installed ( assuming its a version of Raspbian)
lsb_release -irdc