Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for lingering potion in Minecraft is shown below:
Items from earlier versions of Minecraft were assigned a numerical ID - a unique number to represent it.
The numerical ID for Lingering Potion is:
The Lingering Potion item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
Lingering potions can be used to leave a potion effect that 'lingers' on the ground for a longer period of time that a potion like a splash potion would.