Sign Decal Corrugated Metal 5x1
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 (32 POIs)
Champions Coliseum (tier 5), Downtown Marketplace (tier 4), Hotel Zombona (tier 4), McOivey Farms (tier 4), Pergola Apartments (tier 4), Pipeline Gas Co (tier 4), Stand Tower (tier 4), Super Shamway (tier 4), Ann Hoing's Telemarketing (tier 3), Bill Gearz Place (tier 3), Buy-N-Go Grocery (tier 3), Greg's Motel (tier 3), Bombshell News (tier 2), Downtown Evacuation Point (tier 2), Nick's Motel (tier 2), Red Ruby's (tier 2), Century Outlet (tier 1), Dick's Diner (tier 1), Jerry's Fill (tier 1), Joe's USA (tier 1), Mercy Point Camp (tier 1), Motel Seven (tier 1), Bloomington Square, Bruno's Boulevard, HNN Bank Building, Kountry Mart, Navezgane Outlets, Patriot Pavilion, Pete's Grill, Resolution Square, Rogue Nerds Refuge, Shady Rest Area.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.