> We exclude from consideration what we refer to as special-purpose varieties of the language. Newspaper headlines, road signs, notices, and the like have their own special styles of abbreviation (Man bites dog, arrested; EXIT ONLY THIS LANE), and we do not provide a full treatment of the possibilities. Likewise, we do not provide a description of any special notations (chemical formulae, telephone numbers, email addresses) or of the special language found in poetry, heraldic descriptions, scientific works, chemical compound naming, computer jargon, mathematical proofs, etc.