The acronym CMOS used to mean to me the memory in a computer that wasn't lost when the power was turned off. It holds the date and time, configuration data, etc. Yawn.
Now it means the "Chicago Manual of Style".
I've always loved style manuals, whatever their reach or status, but I really adore the Chicago Manual of Style. My new edition, the new 16th edition, just came today from Amazon.
What makes It especially great is its "meta-ness", the fact that it often serves as its own example. It's like a movie aware of itself but that doesn't make it explicit, a poem about poetry, a painting about painting. It's a book about books. Lovely.
And it smells good.