Result: 6× Packed Ice Brick Slab
Packed Ice Brick Slab is a shaped crafting recipe that uses 3 items: 3 Packed Ice Bricks. 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.
Read the Packed Ice Brick Slab article in our Minecraft wiki
You need 3 Packed Ice Bricks — 3 items in total, arranged as shown in the crafting grid. The recipe gives you 6× Packed Ice Brick 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.
Packed Ice Brick Slab is an ingredient in 1 crafting recipe, for example Chiseled Packed Ice.