That means it's grounded. That's good to know. Anybody know for sure about the Acer? I have one laptop cord that isn't grounded and if I have my arm on it just wrong, it will shock me (NOT a Chromebook, btw).
I think grounded laptops/netbooks are much better than ungrounded ones. While that could be a hassle if you are at someones house who happens not to have grounded wall plugs you could always carry a 3 pronged adapter.