Neutral citation is a unique court-assigned reference number for a judgment in a common law jurisdiction. Neutral generally refers to "vendor neutral” / “publisher neutral”. These decisions are not dependent, like traditional law reports, on the selection and editing of the text by a particular reporter or publisher.
A typical neutral citation is composed of the following three elements:
Examples of Hong Kong and UK neutral citations:
Tse Henry Edward v Commissioner of Registration  HKCFA 20.
Belhaj v Straw  UKSC 3.
Further information about neutral citation and court abbreivations is available from the websites below.
Practice Direction 5.5 - Submission of Authorities (HKSAR, Judiciary Branch)
Neutral Citation (Incorporated Council of Law Reporting)
When published in a law report, a case is cited with the following elements:
See this example of a reported decision
Fung Kwok Ki v Wing Sang Construction Co Ltd & Others  3 HKLRD 201.
A case published in law report is cited by the abbreivated title of law report. In order to search the law report, one must first identify the full title of the law report. These resources are useful in finding what the abbreviation stands for, that is, the full title of the law report.
D Raistrick, Index to Legl Citations and Abbreviations (4th edn, Sweet and Maxwell 2013).