What is the correct first name? i want to know the correct name for the triangle screw driver...

i want to know the correct name for the triangle screw driver that are used to repair electrical things
and what size i involve to fix my daughters nintendo ds
i only involve to fix the on/off button but don't want to have to distribute it off to be fixed when i know i can do it my self as long as i own this screw driver but i don't know what it's called
Mobile Home Fixer Upper----Questions??
Answers:    i needed one of these for a gameboy mortgage.
i searched on ebay and found it timetabled as a "tri-wing" screwdriver. it cost about lb4 including postage.
Installing a pet door on bi-fold closet door?
There are an assortment of shapes of security screw designed to stop people introductory the case of electrical equipment. Maplin's do a screwdriver set near everything in it.