Decor and furniture
Sign Decal Corrugated Metal 8x1
It's a sign. You write things on it.
Harvest drops
Iron× 10
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Scrap Metal Pile (60% of the time) where it lands.
Where to find (8 POIs)
NDC Checkpoint Three (tier 4), NFD Downtown HQ (tier 4), Restaurant Zelekt (tier 4), Pass-N-Gas Truck Plaza (tier 3), The Burgcaneer (tier 3), Deserted Working Stiff Tools, Ship-n-sip Station, Westwood Place.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.