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2. Hospital emergency codes - Wikipedia

   en.wikipedia.org/wiki/Hospital_emergency_codes

   Hospital emergency codes are coded messages often announced over a public address system of a hospital to alert staff to various classes of on-site emergencies. The use of codes is intended to convey essential information quickly and with minimal misunderstanding to staff while preventing stress and panic among visitors to the hospital.

3. 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).

4. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

5. ISO 3166-1 alpha-2 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1_alpha-2

   The United Nations uses a combination of ISO 3166-1 alpha-2 and alpha-3 codes, along with codes that pre-date the creation of ISO 3166, for international vehicle registration codes, which are codes used to identify the issuing country of a vehicle registration plate; some of these codes are currently indeterminately reserved in ISO 3166-1.

6. List of dialling codes in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/List_of_dialling_codes_in...

   This is a list of telephone dialling codes in the United ... The code 0999 was used for dialling by PO operators only to mobile relief exchanges in the Glasgow area ...

7. Digital coupon - Wikipedia

   en.wikipedia.org/wiki/Digital_coupon

   7-Eleven e-coupon from Taiwan. Digital coupons (also known as e-coupons, e-clips or clipped deals) are the digital analogue of paper coupons which are used to provide customers with discounts or gifts in order to attract the purchase of some products. Mostly, grocery and drug stores offer e-coupon services in loyalty program events.