Lowercase j. Can be turned into a Pine Log.
The item id for Metro J Wood 0 in unturned is 57098. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Size_X: 1
Size_Y: 2
Size_Z: 0.75
Blueprints: 1
Blueprint_0_Type: Gear
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 57098
Blueprint_0_Product: 41
Blueprint_0_Products: 2
Blueprint_0_Build: 27