Block-capped, unhittable, uncrushable, combat table coverage -- all these terms (some deprecated, some still relevant) refer to the same basic principle: achieving 102.4% block and avoidance in order to push normal hits off the combat table.
Now, what I just said in that last sentence might be an arcane mishmash for some folks who are new to tanking, and I aim to fix that. One of the most potent things you can do for your gearing is hit that magic 102.4% number, to achieve full combat table coverage. Doing so, you're looking at least a constant 40% damage reduction for any melee hit. This is the holy grail for shield tanks right now. Let's talk about how to make that happen.