TYPO3 should always be written in uppercase when used as the product
name. The only exception is for URLs. Also note that the number "3" is
part of the product name. It's not a version number and there's no space
between "TYPO" and "3".

Rules for texts: Always write all letters in uppercase.

Do's:
"TYPO3 version 4.0"
"We use TYPO3 for all our sites."

Don'ts:
"Typo3 is great."
"I use typo3."
"TYPO 3"


Rules for URLs:
Lowercase unless it's the first word of a sentence.

Do's:
"www.typo3.domain"
"typo3.domain"

Don'ts
"Go to this page at Typo3.domain"
"TYPO3.domain"
"www.Typo3.domain"
"www.TYPO3.domain"
"WWW.TYPO3.DOMAIN"

Furthermore never use any of the following styles when writing TYPO3:

- Underline
- Italic
- with a 3 written as a word: three
- Seperated in any way. Examples: typo 3, typo-3
- In quotation marks
- Vertical. Example:
T
Y
P
O
3