Nether brick rods (or possibly just Nether rods) are nether-brick-colored rods, similar to End rods, but without the feature of lighting up an area. They can be placed horizontally or vertically.
The recipe for nether brick fences would be changed to use nether brick rods in the middle column, much like the recipe for wooden fences uses sticks in the middle column. This makes the recipes consistent and leaves room for nether brick walls to be added later.
Possible 3x3 recipe: three nether bricks in left column, three nether bricks in right column, three sticks in middle column. Blaze rods instead of sticks is also a possibility, although it makes netherbrick fences expensive.