Tom Landry Strategy Football What Is The Symbol That Is Next To Many Of The Signs At The Tom Landry Highway In The Dallas/ Fort Worth Metro

What is the symbol that is next to many of the signs at the Tom Landry Highway in the Dallas/ Fort Worth Metro - tom landry strategy football

It is a sign of the Tom Landry Highway, had Dallas / Fort Worth, I see often in conjunction with the road, but I could never understand what it is. Perhaps one of yall could ....?