Decor and furniture
Sign Decal Wood 11x1
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 (5 POIs)
Navezgane High School (tier 4), Sprout & Sons Nursery (tier 4), Pal's Marina (tier 2), Skamson Grocery (tier 1), Demolition Site.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.