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  2. Alternating caps - Wikipedia

    en.wikipedia.org/wiki/Alternating_caps

    Alternating caps. Alternating caps, [1] also known as studly caps [a] or sticky caps (where "caps" is short for capital letters ), is a form of text notation in which the capitalization of letters varies by some pattern, or arbitrarily (often also omitting spaces between words and occasionally some letters), such as "aLtErNaTiNg CaPs", "sTuDlY ...

  3. 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 ...

  4. Hebrew numerals - Wikipedia

    en.wikipedia.org/wiki/Hebrew_numerals

    By convention, the numbers 15 and 16 are represented as ט״ו ‎‎ (9 + 6) and ט״ז ‎‎ (9 + 7), respectively, in order to refrain from using the two-letter combinations י-ה ‎‎ (10 + 5) and י-ו ‎‎ (10 + 6), which are alternate written forms for the Name of God in everyday writing.

  5. Trifid cipher - Wikipedia

    en.wikipedia.org/wiki/Trifid_cipher

    As discussed above, the cipher requires a 27-letter mixed alphabet: we follow Delastelle by using a plus sign as the 27th letter. A traditional method for constructing a mixed alphabet from a key word or phrase is to write out the unique letters of the key in order, followed by the remaining letters of the alphabet in the usual order.

  6. Anagram - Wikipedia

    en.wikipedia.org/wiki/Anagram

    Anagram. An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. [1] For example, the word anagram itself can be rearranged into the nonsense phrase "nag a ram"; which is an Easter egg suggestion in Google after searching for the word "anagram".

  7. Two-square cipher - Wikipedia

    en.wikipedia.org/wiki/Two-square_cipher

    The two-square cipher uses two 5x5 matrices and comes in two varieties, horizontal and vertical. The horizontal two-square has the two matrices side by side. The vertical two-square has one below the other. Each of the 5x5 matrices contains the letters of the alphabet (usually omitting "Q" or putting both "I" and "J" in the same location to ...

  8. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes (as did Fibonacci ...

  9. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Ternary: The base-three numeral system with 0, 1, and 2 as digits. Quaternary: The base-four numeral system with 0, 1, 2, and 3 as digits. Hexadecimal: Base 16, widely used by computer system designers and programmers, as it provides a more human-friendly representation of binary-coded values.