The short titles for these Acts were distinguished from those passed by the Westminster parliament by the insertion of the bracketed words "Northern Ireland" between the word "Act" and the year. Thus Police Act (Northern Ireland) 1970 was an Act passed by the Parliament of Northern Ireland, whereas the Police (Northern Ireland) Act 1998 was passed at Westminster.
As with UK legislation, Northern Ireland's Acts of Parliament were traditionally cited using the regnal year(s) of the parliamentary session in which they became law. The current convention is generally to only use the calendar year. Thus the Civil Pensions Act (Northern Ireland) 1925 can be cited either as "15 & 16 Geo. 5 c. 2 (N.I.)" or more commonly as "1925 c. 2 (N.I.)". Note that by convention "(N.I.)" is also added after the chapter number; again, this is to avoid confusion with Westminster legislation.