A homeopathic repertory is essentially an index of symptoms arranged in some logical fashion. Each symptom or rubric has beside it a number of remedies which are known for the symptom. By known, we mean that the symptom has some relationship to the remedy. It may have been produced in a proving or from clinical experience. In any event a high degree of certainty must be accorded any inclusion. Errors have occurred and are continually corrected. Debate is alive about the veracity of a particuliar inclusion.

A line on the page of a repertory might look like this.

Mind; Fear; Animals; Snakes, of (19): lach. abel. arg-n. ars. bell. calc. calc-s. carc. elaps. hep. ign. spig. sulph. syph.

Each of the above is an abbreviation for the full name of a remedy such lach = lachesis muta. Often the abbreviation includes the name of the author or the authoritative source from where the entry is derived. For example, "Schm" indicates that it has come from the book "Homeopathy and Minerals" by Jan Scholen.

The most popular modern Repertories are "The Complete Millennium Repertory" and "Synthesis".

Considerable information on the subject is available at http://www.repertory.org