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2. English Braille - Wikipedia

   en.wikipedia.org/wiki/English_Braille

   English Braille, also known as Grade 2 Braille, [1] is the braille alphabet used for English. It consists of around 250 letters ( phonograms ), numerals, punctuation, formatting marks, contractions, and abbreviations ( logograms ). Some English Braille letters, such as ⠡ ch , [2] correspond to more than one letter in print.

3. Computer keyboard - Wikipedia

   en.wikipedia.org/wiki/Computer_keyboard

   Typing on a laptop keyboard. A computer keyboard is a peripheral input device modeled after the typewriter keyboard [ 1][ 2] which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Replacing early punched cards and paper tape technology, interaction via teleprinter -style keyboards have been the main ...

4. Alphabetic numeral system - Wikipedia

   en.wikipedia.org/wiki/Alphabetic_numeral_system

   An alphabetic numeral system employs the letters of a script in the specific order of the alphabet in order to express numerals. In Greek, letters are assigned to respective numbers in the following sets: 1 through 9, 10 through 90, 100 through 900, and so on. Decimal places are represented by a single symbol.

5. Braille ASCII - Wikipedia

   en.wikipedia.org/wiki/Braille_ASCII

   The numbers 1 through 9 and 0 correspond to the letters a through j, except that they are lowered or shifted lower in the Braille cell. For example, ⠉ dots 1-4 represents c, and ⠒ dots 2-5 is 3. The other symbols may or may not correspond to their Braille values.

6. Phonics - Wikipedia

   en.wikipedia.org/wiki/Phonics

   Phonics is a method for teaching reading and writing to beginners. To use phonics is to teach the relationship between the sounds of the spoken language ( phonemes ), and the letters ( graphemes) or groups of letters or syllables of the written language. Phonics is also known as the alphabetic principle or the alphabetic code. [ 1]

7. Vigenère cipher - Wikipedia

   en.wikipedia.org/wiki/Vigenère_cipher

   The letter at the intersection of [key-row, msg-col] is the enciphered letter. For example, the first letter of the plaintext, a, is paired with L, the first letter of the key. Therefore, row L and column A of the Vigenère square are used, namely L. Similarly, for the second letter of the plaintext, the second letter of the key is used.