• Webster's Revised Unabridged Dictionary
    • n Guideboard A board, as upon a guidepost having upon it directions or information as to the road.
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Century Dictionary and Cyclopedia
    • n guideboard A board containing directions to travelers, set up at points on the highway or in the woods where paths diverge.
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In literature:

They are the guideboard knocks that point us to the higher pathway.
"The University of Hard Knocks" by Ralph Parlette
There was no guideboard, and he could not remember by which road he had come.
"Bound to Rise" by Horatio Alger
True it is that no other plain is so well supplied with guideboards.
"Lectures of Col. R. G. Ingersoll, Volume I" by Robert Green Ingersoll
Guideboards were few, and human beings fewer.
"The Three Brides, Love in a Cottage, and Other Tales" by Francis A. Durivage