Sign Canvas 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 (28 POIs)
Navezgane Corrections (tier 5), Downtown Marketplace (tier 4), Judy Witch (tier 4), NDC Checkpoint Five (tier 4), NDC Checkpoint One (tier 4), Richard Munchz Plaza (tier 4), Downtown Apartments (tier 3), Le Spank (tier 3), Pass-N-Gas Plaza (tier 3), Savage Country (tier 3), The Road Gentleman Truck Stop (tier 3), Lazy Fitness (tier 2), The "Broken Dreams" house (tier 2), z-work (tier 2), Bob's Cafe (tier 1), Century Outlet (tier 1), Deracinated Domicile (tier 1), Bruno's Boulevard, Buffalo Blues Building, Cascade Tower, Racy's, Rhythm & Brews District, Route 66 Restaurant Row, Sapphire Square, Shabby St. Outlet, The AZ Sport Business Pavilion, Willtronics Corner, ZBrews Row.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.