Nether Brick Slab is a half-block variant of the full-sized Nether Brick block, crafted from Nether Bricks, which are items smelted from Netherrack. These slabs are fireproof and provide a decorative, red, stone-like material used for building and crafting in the Nether. They can be stacked to create full blocks or used as single slabs for a more refined stair, flooring, and roofing designs, allowing for greater architectural detail and efficiency in construction.
This item has no numerical item ID, therefore you must use the item ID to spawn the item. Numerical item IDs were removed in Minecraft version 1.13.
The item id for Nether Brick Slab is minecraft:nether_brick_slab
The item ID for Nether Brick Slab is minecraft:nether_brick_slab
This is the spawn command to give yourself Nether Brick Slab in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give