When reading/writing/talking about electronics, I like to understand the acronyms and mneumonics for abbreviations used for registers, functions, filenames, pin names, etc. Usually, the first time the abbreviation is used, either the context or a parenthetical note sets it off, or it's blatantly obvious.
On the Microchip dsPIC parts, the TRIS register controls the data direction. I can't find a note which uses the full word/phrase that would be abbreviated or have the acronym TRIS. ('The Register Input/output Settting' is about the best I can come up with, although 'TRIS Really Is a Silly abbreviation' is a close second guess).
How do you remember this? I've heard it pronounced as a word, but I'd like to know what it means to make it easier to remember, read, and write.