Sign Decal Corrugated Metal 1x1
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 (28 POIs)
Champions Coliseum (tier 5), Correa Rockworx (tier 5), Beanthere Coffee Company (tier 4), Coleman's Drive-In (tier 4), Holvez Rent-a-Car (tier 4), Hotel Zombona (tier 4), NDC Checkpoint Three (tier 4), Pipeline Gas Co (tier 4), Wasted Stiff's (tier 4), Mamma Pizza (tier 3), BONG Auto Parts Manufacturing (tier 2), NEW Mamma Pizza (tier 2), Nick's Motel (tier 2), Red Ruby's (tier 2), Smarketing (tier 2), The Hoarders' House (tier 2), Bob's Cafe (tier 1), Jerry's Fill (tier 1), Bean Counter Court, Booze Vault, Demolition Site, Downtown Hotel, Fallen Survivor Compound, HNN Bank Building, Kruz-Thru Liquors, Massive Gains Mall, Navezgane Bus Terminal, Plating Company.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.