Result: 6× Purpur Slab
Purpur Slab is a shaped crafting recipe that uses 3 items: 3 Any Purpur Block. Place the ingredients exactly in the pattern shown above. The pattern can sit anywhere on the grid as long as its shape stays the same. It needs the full 3×3 grid, so you have to use a crafting table. "Any Purpur Block" means any of 2 kinds: Purpur Block, Purpur Pillar.
You need 3 Any Purpur Block — 3 items in total, arranged as shown in the crafting grid. The recipe gives you 6× Purpur Slab.
Yes. The recipe needs the full 3×3 grid, which only a crafting table offers.
It is a shaped recipe: the arrangement matters. You can shift the pattern around the grid, but the shape must stay the same.
Yes. "Any Purpur Block" means any of 2 kinds: Purpur Block, Purpur Pillar.
Purpur Slab is an ingredient in 1 crafting recipe, for example Purpur Pillar.