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2. ZIP Code - Wikipedia

   en.wikipedia.org/wiki/ZIP_code

   A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels. A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [2] ( zipping along) when senders use the ...

3. List of airline codes (O) - Wikipedia

   en.wikipedia.org/wiki/List_of_airline_codes_(O)

   This is a list of all airline codes. The table lists the IATA airline designators , the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.

4. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   Rolling code. A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.

5. List of postal codes - Wikipedia

   en.wikipedia.org/wiki/List_of_postal_codes

   NNNNN for PO Boxes. NNNNN-NNNN for home delivery. A complete 13-digit code has 5-digit number representing region, sector, city, and zone; 4-digit X between 2000 and 5999; 4-digit Y between 6000 and 9999. [22] Digits of 5-digit code may represent postal region, sector, branch, section, and block respectively.

6. List of airline codes (S) - Wikipedia

   en.wikipedia.org/wiki/List_of_airline_codes_(S)

   This is a list of all airline codes. The table lists the IATA airline designators , the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.

7. Slave codes - Wikipedia

   en.wikipedia.org/wiki/Slave_codes

   The slave codes were laws relating to slavery and enslaved people, specifically regarding the Atlantic slave trade and chattel slavery in the Americas. Most slave codes were concerned with the rights and duties of free people in regards to enslaved people. Slave codes left a great deal unsaid, with much of the actual practice of slavery being a ...