Sign Canvas Corrugated Metal 5x2
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 (20 POIs)
Diamond's Mens Club (tier 4), Downtown Marketplace (tier 4), Hybrid Energy (tier 4), Joe's Junction (tier 4), Fire Station 8 (tier 3), Navezgane Fire District #3 (tier 3), BONG Auto Parts Manufacturing (tier 2), Federal Appliance (tier 2), Jericho Ranch (tier 2), Luigi's Pizza (tier 2), Maggie's Corner Cafe (tier 2), Buzz's Bar (tier 1), Marvin's Restaurant (tier 1), Bruno's Boulevard, Cascade Tower, Couch Kingz Court, Four Oaks Apartments, Ivant Business Park, Navezgane Outlets, Route 66 Restaurant Row.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.