Abbreviation methods are alphabet-based and use different abbreviating approaches. The abbreviation CP is common, although abbreviating drug names is not best practice in medicine. Omitting his first name, and abbreviating his middle name, he calls himself "Jeff" Johnson. The example above assumes British pronunciation by abbreviating "military" to "militry". During the growth of philological linguistic theory in academic Britain, abbreviating became very fashionable. Abbreviating commands with shifted letters is unique to Commodore BASIC. In mathematics, "rational" is often used as a noun abbreviating "rational number". The term is a Canadianism formed by abbreviating the word "decoy". The USPS recommends not abbreviating the name as St. and to use the full name. Thus she compromised by abbreviating it to R. H. This version modified a few of the abbreviating principles also. This method of abbreviating access to record fields is not implemented in Oberon or Oberon-2. The symbol for percent (%) evolved from a symbol abbreviating the Italian "per cento".