ATIO stands for: The Association of Translators and Interpreters of Ontario.

This is the most expensive option, and you do not need this type of translation except for the following: 

1) To change your name after marriage.

2) To apply for a Canadian passport.

3) To obtain a license/certificate.

Examples: 

• Ontario Motor Vehicle Industry Council (OMVIC)
• Certified Public Accountant (CPA)
• Ontario College of Teachers (OCT)
• National Nursing Assessment Service (NNAS)
• College of Physicians and Surgeons of Ontario (CPSO)
• Professional Engineers of Ontario (PEO)

Please confirm if your institution specifically requires ATIO-certified translations.