C.F.

The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted.
Entry	Source	Expression	Field
c.f.	Portuguese	Câmara fechada	N/A
Source: compiled by the editor, based on several corpora (additional references).

Commercial Usage: C.F.

Domain	Title
Books	Carl Friedrich Gauss : (1777-1855) : Sammelband von Beitrèagen zum 200. Geburtstag von C.F. Gauss (reference) Guitar Identification: A Reference Guide to Serial Numbers for Dating the Guitars Made by Fender, Gibson, Gretsch, C.F. Martin & Co (reference) From the desk of Truckee's C.F. McGlashan : his letters to Eliza Donner Houghton, Donner Party survivor, investigative report of a massacred wagon train, Truckee-Tahoe adventures and more (reference) Lebendig abgeschieden : C.F. Meyers Berglyrik sub specie mortis, Biographie und Metaphantasie (reference) States of Unconsciousness in Three Tales by C.F. Meyer (reference) (more book examples)
Source: compiled by the editor from various references; see credits.

Photo Album: C.F.

Thumbnail	Description & Credit	Thumbnail	Description & Credit
	[The Three Fates] / C.F. Stoelzel sc. Dresde 1796. Credit: National Library of Medicine.		C.F. Heim : Der Arzneiwissenschast und Wundarzneikunst Dr. / Gezeichn. von C.F. Tüchtzer. Druck v. Helmlehner. Credit: National Library of Medicine.
	Paulus Gyöngyössi a Petteny Med. Doctor / C.F. Fritzsch ad vivum delin. et Sculp. Credit: National Library of Medicine.		Coolidge receives Republican National Committee--In front row are H.L. Rummell, C.F. Huffman, John Coolidge, Mrs. Coolidge, President Coolidge, Frederick H. Gillett, Mr. and Mrs. Frank W. Mandell and others on the south portico of the White House. Credit: Library of Congress.
	Residence of C.F. Brush, Euclid Ave., Cleveland. Credit: Library of Congress.		C.F. Newman and Sons, Seedsmen, Adelaide, Australia. Credit: Library of Congress.
	Hamilton Watch Factory. Portrait of C.F. Miller I. Credit: Library of Congress.
Source: pictures compiled by the editor from various references; see picture credits.

Familiar Quotations: C.F.

Usage Frequency: C.F.

"C.F." is generally used as a lexical verb (base form) -- approximately 100.00% of the time. "C.F." is used about 13 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted)

Alternative Orthography: C.F.

Hexadecimal (or equivalents, 770AD-1900s) (references)

43 2E 46 2E

Leonardo da Vinci (1452-1519; backwards) (references)

Binary Code (1918-1938, probably earlier) (references)

01000011 00101110 01000110 00101110

HTML Code (1990) (references)

&#67 &#46 &#70 &#46

ISO 10646 (1991-1993) (references)

0043 002E 0046 002E

Encryption (beginner's substitution cypher): (references)

Author	Quotation
C.f. Kettering	If a fellow wants to be a nobody in the business world, let him neglect sending the mail man to somebody on his behalf.
Source: compiled by the editor from various references.

Parts of Speech	Percent	Usage per 100 Million Words	Rank in English
Lexical Verb (base form)	100%	13	97,576

C.F.

Abbreviations & Acronyms: C.F.

c.f.

Crosswords: C.F.

Commercial Usage: C.F.

Books