An unstable subatomic particle of the lepton class, with a charge of −1 and a mass roughly 3500 times that of the electron.

Telephone numbers should be written in the following format

+XX YY ZZ ZZZ ZZ

Where (+XX) is the country code, (YY) the area code, and then the rest (ZZ ZZZ ZZ).

The area code for Geneva is 22 and all CERN telephones start with 76. So most CERN numbers will be in the format

+41 22 76 ZZZ ZZ

CERN internal phone numbers are all five-digit numbers, all reachable directly from CERN.

Examples:

The SI-derived unit of magnetic flux density. Though it has a lower-case "t" when spelled out it full, its symbol is an upper-case "T". 

So: 

The tesla (T) is the SI-derived unit of magnetic flux density.

Use 2pm, 3.30am (closed up) unless there is a good reason not to.

Note: noon is 12pm, midnight is 12am. It may be clearer to say "noon" or "midnight"

For press releases as well as military, space and similar stories, the 24-hour clock may be more appropriate:

1630 GMT, 1130 Eastern Standard Time

Note: To configure the correct date format on a Drupal site, go to admin/config/regional/date-time/formats/40/edit. 

The PHP code you need to add in the Format string box is "j M Y, g.ia"

One word, no hyphen.

Do not use titles such as Mr, Miss, Dr or Professor.

Job titles

Only use one job title for each person. Do not capitalize job titles, unless it is an important government position: Barack Obama, President of the US.

The single exception is CERN Director-General.

Correct uses

"This is a fantastic result for CERN," says ATLAS spokesperson Albert Einstein.

British Foreign Secretary William Hague agreed.

Means a thousand billion, (the same as one million million) but use with care. House style dictates it may be clearer to say 10¹². See numbers.

Use 10¹⁵ rather than quadrillion, unless you are deliberately setting out to put dramatic effect ahead of clarity.