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It was called a dash board years before automobiles. It hoped to keep dirt off the occupants when the horses dashed ahead.
I don't remember the year Ford stopped calling it a firewall but my memory says in the 70's. Firewall was thought to be a scary intimidating term so they stopped using it for the sake of political correctness. Dash board is a common term for what Ford calls the IP(Instrument Board) or IB (Instrument Board).