Decor and furniture
Sign Canvas Wood 4x2
It's a sign. You write things on it.
Harvest drops
Wood× 2
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Wood Debris (Terrain) (75% of the time) where it lands.
Where to find (6 POIs)
Correa Rockworx (tier 5), The Last Sunset Nursing Home (tier 5), Treats Terrace (tier 2), JBB Worksite #27, Montgomery Public School, Rhythm & Brews District.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.