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2. Message authentication code - Wikipedia

   en.wikipedia.org/wiki/Message_authentication_code

   In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity-checking a message. In other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity).

3. Advanced Audio Coding - Wikipedia

   en.wikipedia.org/wiki/Advanced_Audio_Coding

   Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression.It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate.

4. Speech code - Wikipedia

   en.wikipedia.org/wiki/Speech_code

   A speech code is any rule or regulation that limits, restricts, or bans speech beyond the strict legal limitations upon freedom of speech or press found in the legal definitions of harassment, slander, libel, and fighting words. Such codes are common in the workplace, in universities, [1] and in private organizations. The term may be applied to ...

5. E number - Wikipedia

   en.wikipedia.org/wiki/E_number

   A solution of E101 riboflavin (also known as vitamin B2) Crystals of E621 monosodium glutamate (MSG), a flavour enhancer. E numbers, short for Europe numbers, are codes for substances used as food additives, including those found naturally in many foods, such as vitamin C, for use within the European Union (EU) [1]: 27 and European Free Trade Association (EFTA). [2]

6. Discount function - Wikipedia

   en.wikipedia.org/wiki/Discount_function

   A discount function is used in economic models to describe the weights placed on rewards received at different points in time. For example, if time is discrete and utility is time-separable, with the discount function having a negative first derivative and with (or () in continuous time) defined as consumption at time t, total utility from an infinite stream of consumption is given by

7. Code word (figure of speech) - Wikipedia

   en.wikipedia.org/wiki/Code_word_(figure_of_speech)

   A code word is a word or a phrase designed to convey a predetermined meaning to an audience who know the phrase, while remaining inconspicuous to the uninitiated. For example, a public address system may be used to make an announcement asking for "Inspector Sands" to attend a particular area, which staff will recognise as a code word for a fire or bomb threat, and the general public will ignore.