Is there any phrase or word that can be used to describe a slip of the tongue that happens in writing?
Calling it a slip of tongue directly feels awkward, especially when the written text is never intended to be read out loud (for example text from a discussion on an SE site such as this).
I've just read "slip of the keyboard" but I'm pretty sure that this is not (yet?) a common phrase.
"Typo" is a very similar term, but I usually use "typo" more for mis-typed words rather than mistakes that actually change the meaning of the text.
Best Answer
It's called a slip of the pen (more common), or slip of the keyboard (less common).
Either is fine, and will be understood. If you desire to be precise with your idioms, go ahead and use "slip of the keyboard". It's not in as many dictionaries/thesauruses, but people use it, and it makes enough sense that no one should misunderstand it.
I also agree with KeithS: typo would be fine in many cases of "slips of the keyboard", however the "slip" idioms usually indicate more of a mistake in the writer's mind (wrong choice of word) than a typing error, as with "slip of the tongue". "Typo" usually has to do with a small mistake involving a few letters, which the typist did not mean to include, whereas "slip of the pen" or "slip of the keyboard" indicates a mistake of greater scale, such as choosing the wrong word, which, at the time, the typist usually did mean to include, but later realizes his mistake.