What the heck does that mean?

Acronyms! Acronyms everywhere.

  RAZ/WI - Read as Zero, Writes Ignored (ARM Slang).

I find it annoying when I'm reading a document that is dissiminated with
acronyms.  If I'm not familiar with the acronym in question, my brain will
automatically skip over it and attempt (and often fail) to make sense of the
phrase without that bit of information.  If there are a few of them in a row,
I often just get a /Fnord/ effect.

Fortunately, and not so surprisingly, I'm gradually adapting to all this
slang.