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.

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…

Antiproton Cell Experiment

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.