Cf. Peroryctes Sp.

The abbreviation cf. (short for either Latin or , both meaning 'compare') is generally used in writing to refer the reader to other material to make a comparison with the topic being discussed. However some sources offer differing or even contradictory usage guides, as covered below. In Italian, the abbreviation "cfr." (''confronta'', 'confront') is more common than "cf."

Conflicting and differing usage guides

Style guides such as The University of North Carolina at Chapel Hill writing center and the Chicago Manual of Style recommend that "cf." be used only to suggest a comparison, and the words "see" or "vide" be used generally to point to a source of information. However a 2010 American Psychological Association (APA) style guide states cf. should be "used to provide contrasting or opposing information" and that "to compare like things, use "see" or "see also."

Meanwhile Wex, the online legal dictionary created by Cornell Law School, suggests that "a cf. source simply offers a different yet non-contradictory claim and actual support to the claim just made should not be assumed. If the source gives a contradictory claim, a negative signal should be used." They offer, "in order from mutually exclusive to somewhat contradictory," Contra, But see, and But cf. as examples of proper negative signals for contradicting claims.

The conflicts between these definitions may suggest a general confusion or disagreement as to proper usage or differing conventions between scholarly disciplines such as law and psychology.

Biological use

In biological naming conventions, cf. is commonly placed between the genus name and the species name to describe a specimen that is hard to identify because of practical difficulties, such as poor preservation. For example, " cf. " indicates that the specimen is in the genus ''Barbus'' and believed to be , but the actual species-level identification cannot be certain.

Cf. can also be used to express a possible identity, or at least a significant resemblance, such as between a newly observed specimen and a known species or taxon. Such a usage might suggest a specimen's membership of the same genus or possibly of a shared higher taxon. For example, in the note ", cf. ", the author is confident of the order and family (Diptera: Tabanidae) but can only suggest the genus (''Tabanus'') and has no information favouring a particular species.

Numismatic use

Among numismatists (coin collector-research specialists), cf. may be used in references on the paper and/or online coin identification information meaning "compare to". It is common for abbreviations of listings in trusted coin catalogues or sales from certain online auctions to be cited when identifying a particular coin. If the specimen in question is not an exact match but comes close to a known source, cf. may be used.

See also

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* List of Latin abbreviations

References

External links

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* {{Wiktionary-inline, confer

Abbreviations
Latin words and phrases