Knights Insignia (warrior) can this rune be stacked?

I"am not sure if you can stack this rune. If so can it be stacked to each individual equiped piece of armor? Hope this makes since to someone out there. Thanks!

They can be "Stacked" in a way.

If the "Hit" lands on the piece of armor that has the knight insignia, then it will be reduced by 3. If it lands on a piece without the insignia then it will not be reduced.

So you can "Stack" them in that you can have 1 on each piece, but the benefits don't stack so that you get -15 reduction.

may sound abit obvious but... insignias arent runes, the major difference is that rune are global and none stacking. Most of the time insignias are only local to the piece of armor your attaching it to. Thus i recommend you attach knights to your body and legs armor due to 70% of all attacks hitting them. Then use utility insignias on the rest such as stonefist if you use kds and survivor for a tad bit more health.

It's hard to know exactly what you mean here, so forgive me if I restate the obvious.

You can't put more than one Insignia or Rune on each piece of armor, so in that sense they can't be "stacked to each individual piece".

Each Knight's Insignia only affects the armor piece it is on. You would need to put a Knight's Insignia on all 5 pieces if you wanted all areas to have the -3 reduction. They don't "stack" to give you -15 overall.

They do, however, stack with a Rune of Absorption. The Absorption rune is "global" which means it gives -3 (for Superior) damage reduction to your whole character, not just individual armor pieces. So, any piece that has a Knight's insignia would have -6 reduction - 3 from the Knight's, 3 from the Absorption.