The code consists of a dictionary of common words or phrases and their associated abbreviations. Extremely common terms are represented by a single letter (C - See; Y - Year); those less frequently used gain successively longer abbreviations (Ab - About; Abb - Abbreviate; Abty- Ability; Acmpd - Accompanied).
Telegraph operators would often interleave Phillips Code with numeric "Wire Signals", to describe the article's priority or confirm its transmission. This meta-data would occasionally appear in printed newspapers, especially the code for "End of article" - 30.
see also: Morse Code