I'm not dead,
i'm not alive,
i'm not underground,
i'm high up in the sky,
people speak of me but never saw me.
Who am i?
I have a thumb and four fingers, but I have no flesh or bone. Who am I?
I do not have fingers, but I have a ring.
Dogs bark when they hear me ding.
I introduce visitors, though not by their names.
Naughty little children push me in their games.
What am I?