2001 in Roman Numerals
2001 is MMI, two thousands and a single unit. Short, balanced and a favourite for minimalist date pieces.
How MMI is formed
M + M + I = 1000 + 1000 + 1 = 2001.
Where MMI is used
A year numeral turns up in different places from a bare number. These are the four that send people looking for MMI.
- Date tattoos and engravings. A year-only piece is just MMI, and a full date stacks the day and month above it. MMI is 3 characters long, which matters more than people expect: it sets how wide the bottom line of a stacked date will sit.
- Copyright lines in credits. Film and television end credits have long set the copyright year in Roman numerals, so a production from 2001 carries MMI on its end card. If you are reading a numeral off a title sequence rather than writing one, this is usually the one you have found.
- Cornerstones and dedications. Buildings, monuments and foundation stones carry their year in numerals, which is why MMI turns up carved rather than typed. Every year between 2000 and 2099 opens with MM, so on a datestone it is the letters after MM that tell you which year you are actually looking at.
- Anniversaries. In 2026, a date from 2001 is 25 years old, so MMI is the numeral for a 25th anniversary this year. Wedding and birth years are the two most common reasons to want MMI written correctly.
2001 in history
2001 is remembered for the September 11 attacks, and as the year Apple released the first iPod.
Convert another year or number
2001 is written MMI in Roman numerals.
Frequently asked questions
How do you write the year 2001 in Roman numerals?
The year 2001 is written MMI. Reading left to right that is M (1000) + M (1000) + I (1), added together to reach 2001.
What happened in 2001?
2001 is remembered for the September 11 attacks, and as the year Apple released the first iPod. Written as a Roman numeral, 2001 is MMI, which is the form you will see it carved or inked.
Why does MMI start with MM?
MM is the numeral for 2000, and every year from 2000 to 2099 opens with it. The letters after it, I, carry the remaining 1.
Is MMI the same as 2001 on a clock?
No. Clock faces only run to XII, so a year never appears on a dial. MMI belongs on dates: credits, cornerstones, engravings and tattoos. A numeral read off a watch face is an hour between I and XII, not a year.
Years people look up next
The decade anchors either side of 2001, its immediate neighbours, and the quarter and half century marks that anniversaries land on.