[Shop-talk] 'tri-'screwdriver?

[scott.hall at comcast.net]

my kid broke his nintendo ds screen.  I got a new screen, and all the websites reference buying a special screwdriver.  screw (ahem) that, I've got a full compliment.  well, this is a 'tri'-headed driver.  like a phillips, but instead of a four-pointed 'plus' sign, it's got three prongs, arrayed like a mercedes symbol.  anybody know what this thing is called, or where (like mcmaster) I can buy one, besides the nintendo folks?  I don't even know what to type into a search engine.

thanks.

scott