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  2. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    t. e. In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by ...

  3. Leet - Wikipedia

    en.wikipedia.org/wiki/Leet

    Leet. Leet (or " 1337 "), also known as eleet or leetspeak, or simply hacker speech, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via reflection or other resemblance.

  4. Hexspeak - Wikipedia

    en.wikipedia.org/wiki/Hexspeak

    Hexspeak. Hexspeak is a novelty form of variant English spelling using the hexadecimal digits. Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF.

  5. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...

  6. English alphabet - Wikipedia

    en.wikipedia.org/wiki/English_alphabet

    Modern English is written with a Latin-script alphabet consisting of 26 letters, with each having both uppercase and lowercase forms. The word alphabet is a compound of alpha and beta, the names of the first two letters in the Greek alphabet. Old English was first written down using the Latin alphabet during the 7th century.

  7. Grawlix - Wikipedia

    en.wikipedia.org/wiki/Grawlix

    Grawlix ( / ˈɡrɔːlɪks /) or obscenicon is the use of typographical symbol to replace profanity. Mainly used in cartoons and comics, [ 1][ 2] it is used to get around language restrictions or censorship in publishing. At signs (@), dollar signs ($), number signs (#), ampersands (&), percent signs (%), and asterisks (*) are oft-used symbols ...

  8. List of aircraft registration prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft...

    a group of three to five characters, which characters can be a combination of capital letters in Romancharacter and/or Arabic numbers Marshall Islands: V7 [3] V7-0001 to V7-9999 Martinique: F-O [16] Outside mainland France is F-OAAA to F-OZZZ [g] [16] Mauritania: 5T [3] 5T-AAA to 5T-ZZZ Mauritius: 3B [3] 3B-AAA to 3B-ZZZ. Colonial allocation VQ ...

  9. Numeronym - Wikipedia

    en.wikipedia.org/wiki/Numeronym

    Numeronym. A numeronym is a word, usually an abbreviation, composed partially or wholly of numerals. The term can be used to describe several different number-based constructs, but it most commonly refers to a contraction in which all letters between the first and last of a word are replaced with the number of omitted letters (for example ...