The Signpost is a furniture you can build (the Outdoors page).
In-game description
A board on a post. Write what you like on it as you set it up; E reads it, and R while it's read writes it again.SHOWN IN THE BUILD RING
Building it
It costs 2 
Wood, 1 Earth 1 Wind spirits. Take it down with DISMANTLE to get its cost back (see Building).
