I is for International Sizes
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I is International Standard (ISO 216)
While we have our own standard letter and envelope sizes in the United States, internationally, the ISO 216 is the International Standard. It is the metric format that has been adopted by all countries in the world, except the United States and Canada. Although Mexico and the Philippines have officially adopted the ISO 216 standard, our "letter" format is still common. ISO is the abbreviation for “International Organization for Standards". This organization develops and publishes standards for a variety of technical applications, including paper. You may need to know the international standards when you work on a print or design project that will mail or be utilized “across the pond”. You can find a listing of common metric sizes for paper and envelopes here.