The Pi's `hostname` might be the best option. This way, you can even identify each Pi over the network. Another advantage to this method is that it shows the hostname (by default) at the beginning of each line in the command line.

**For example:**

If you had ten RPis in room A-14, then you could change the hostname on each one to:

    raspberrypiA-14-1
    raspberrypiA-14-2
    raspberrypiA-14-3

and so on. Or, to make it smaller:

    piA-14-1
    piA-14-2
    piA-14-3

If you had different models, you could also include the model name in the hostname:

    pi-Zero-A-14-1
    pi-A-A-14-2
    pi-2B-A-14-3


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These hostnames would be visible on the network and you could `ssh` into any of them without their respective IP address.


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There are two ways to change the hostname in Raspbian.

**1.**

The command:

    sudo hostname -b "NEWHOSTNAME"

will change the hostname to `NEWHOSTNAME` upon the next boot.

**2.**

Bring up the Raspbian config with:

    sudo raspi-config

Scroll down to `advanced options`, and then the second option is `hostname`. Type in what you want the new hostname to be, and it will change upon the next boot.