Typos

The plural form of typo, making typographical errors (see typo)

I made more than one typo; therefore, i made typos

Typer's writing syndrome

When you type so often that you begin to write out common typos that would occur when typing, such as switching a "t" for an "r" (because t and r are next to each other on the keyboard).

I was writing my essay by hand because my computer was broken when I wrote the word "proffesot" instead of professor. It was a classic example of my typer's writing syndrome.