Use an before a silent H: an heir, an hour, an honest politician, an honorary consul; use a before an aspirated H: a hero, a hotel, a historian (but don't change a direct quote if the speaker says, for example, "an historic"). With abbreviations, be guided by pronunciation: an LSE student, a CERN student

use italics

Do not use full stops in abbreviations, or spaces between initials, including those in proper names:

US, M&S, WE Weber, WH Smith, etc.

Use all capitals if an abbreviation is pronounced as the individual letters: BBC, VAT, etc; if it is an acronym (i.e. pronounced as a word) spell out with all capitals (NASA, NATO, etc.) unless it can be considered to have entered the language as an everyday word, such as awol, laser and, more recently, asbo and sim card.

Not "the absolute zero".

-273.15 °C or 0 K.

The apparatus was cooled to near absolute zero to ensure that the electronics were in a superconducting state

Spell out the name at first mention, then abbreviate in brackets (but not all names need spelling out for the CERN Courier – see individual entries). Only use capital letters if it is the only machine with that name in the world.

This synchrocyclotron (SC) was built in 1957, whereas the Large Hadron Collider (LHC) was completed in 2009. The SC accelerates ions…

Advisory Committee of CERN Users

for both sexes, never actress

See gender neutrality

no italics, no hyphens

Initial capital letters, "No.", then a space followed by a digit, space, open bracket, "Rev.", space, digit, close brackets. See below: 

Administrative Circular No. 25 (Rev. 3)

Antihydrogen Experiment: gravity, Interferometry Spectroscopy

Note that the alternative spelling “AEgIS”, sometimes stylised with a bar over the g to indicate antimatter, is also used by the collaboration.

As Low As Reasonably Achievable

Antihydrogen Laser Physics Apparatus-2 (preceded by ALPHA)

Can be written without full stops in informal and web contexts, but should be written a.m. and p.m. in official documents, such as minutes.

See time and section 5.c) of the full Style Guide

use italics

Alpha Magnetic Spectrometer

Not Alphamagnetic Spectrometer

Not "analyze"

Astronomy with a Neutrino Telescope and Abyss environmental RESearch

Acronym doesn’t need spelling out for the CERN Courier

of radios