RUBRIC (noun) = (1) A title or heading. (2) A class or category. (3) An authoritative rule on a certain topic. (4) A brief description of a broad topic.
Usage: The first definition gives the original meaning, and the word is derived from the old practice of writing important titles or information in red ink (see Etymology). Meanings (3) and (4) refer to the sort of information that printers or medieval manuscript writers might choose to highlight in red in this way. Meaning (2) is the most commonly encountered today, and is a metaphorical extension of the idea of a "heading." To create rubrics of type (3) or (4) is to "rubricate," and the process itself is "rubrication."
Suggested Usage: We are beset in modern life by pieces of text that are part brief description and part authoritative rule: "The IT department has just issued a little booklet of rubrics concerning the care of the office PCs." Next time you feel the need for the word "heading," try using "rubric" instead: "This long-distance call to the speaking clock in Kuala Lumpur must surely fall under the rubric of 'unnecessary expenditure,' my dear."

INITIAL = Of, relating to, or occurring at the beginning; first: took the initial step toward peace.
Designating the first letter or letters of a word.n. The first letter of a proper name.
INITIALS = The first letter of each word of a person's full name considered as a unit: stationery monogrammed with her initials. The first letter of a word. A large, often highly decorated letter set at the beginning of a chapter, verse, or paragraph.tr.v., -tialed also -tialled, -tial·ing -tial·ling, -tials -tials. To mark or sign with initials, especially for purposes of authorization or approval.