.cd

.cd is the Internet country code top-level domain (ccTLD) for the Democratic Republic of Congo. It was created in 1997 as a replacement for the .zr (Zaire) ccTLD, which was phased out and eventually deleted in 2001.

Except for reserved names like .com.cd, .net.cd, .org.cd and others, any person in the world can register a .cd domain for a fee. The ccTLD is popular (and thus economically valuable) owing to it being an abbreviation for compact disc (other similar ccTLDs are .fm, .am, .tv, .dj, .mu, and .me). Such unconventional uses of TLDs in domain names are known as domain hacks.

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Compact disc

Compact disc (CD) is a digital optical disc data storage format. The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. Audio CDs and audio CD players have been commercially available since October 1982.

Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to about 80 minutes of uncompressed audio or about 700 MiB of data. The Mini CD has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in); they are sometimes used for CD singles, storing up to 24 minutes of audio, or delivering device drivers.

At the time of the technology's introduction in 1982, a CD had greater storage capacity than a personal computer hard drive. By 2010 hard drives commonly had capacities exceeding those of CDs by a factor of several thousand.

C (New York City Subway service)

The C Eighth Avenue Local is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored vivid blue since it uses the IND Eighth Avenue Line in Manhattan. The C operates at all times except late nights, making all stops between 168th Street in Washington Heights, Manhattan, and Euclid Avenue in East New York, Brooklyn via Central Park West / Eighth Avenue in Manhattan and Fulton Street in Brooklyn. During late night hours, the A train, which runs express along the entire C route during daytime hours, makes all stops.

History

The C and CC services began operation on July 1, 1933 over the then-new IND Concourse Line. The CC local provided continuous service between Bedford Park Boulevard and Hudson Terminal during rush hours, and was extended to 205th Street during non-rush hours. The C ran express, from 205th Street to Bergen Street in Brooklyn during rush hours.

Beginning August 19, 1933, C service was cut back from Bergen Street, but started operating during non-rush hours. At the same time, CC service was cut back from 205th Street during non-rush hours.