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m after a number

M after a number

Question from Larry:

I have heard that Million is annotated as MM. But I have heard two answers for Thousands (K, M). Which is correct?

I have not seen MM as an abbreviation for million but I did find a reference to it in Wikipedia.

M is the Roman numeral for 1,000 but in the metric system M designates the prefix mega- which is a million. For example MW is a megawatt. On the other hand m designates milli- or one thousandth so mm is a millimetre or 0.001 metres.

To minimize confusion I would stick with K for a thousand. K comes form the Greek kilo which means a thousand. In the metric system lower case k designates kilo as in kg for kilogram, a thousand grams. Even here there is some ambiguity. In the language of computer science K is 2 10 = 1024.

M after a number Question from Larry: I have heard that Million is annotated as MM. But I have heard two answers for Thousands (K, M). Which is correct? I have not seen MM as an

Get an EORI number

From 1 January 2021 you will need one to move goods between Great Britain (England, Scotland and Wales) and the EU . You may also need one if you move goods to or from Northern Ireland.

This guide is also available in Welsh (Cymraeg).

If you move goods to or from the EU

Apply for an EORI number as soon as possible. It can take up to a week to get one.

You’ll not usually need an EORI number if you only:

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  • move goods between Northern Ireland and Ireland

If you use a post or parcel company they’ll tell you if you need an EORI number.

If you move goods to or from Northern Ireland

From 1 January 2021 you’ll need an EORI number that starts with XI to:

To get advice on moving goods between Great Britain and Northern Ireland sign up for the Trader Support Service. If you sign up your business before 23 November, this will also ensure you’ll be sent an EORI starting with XI.

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Before you apply

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If you need a Government Gateway user ID, use either:

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If you do not already have a user ID, you’ll be able to create one when you apply.

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