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2. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   The plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

3. International Phonetic Alphabet - Wikipedia

   en.wikipedia.org/.../International_Phonetic_Alphabet

   The official chart of the IPA, revised in 2020. The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standardized representation of speech sounds in written form.

4. Z - Wikipedia

   en.wikipedia.org/wiki/Z

   Z is the 26th and final letter of the modern English alphabet and the ISO basic Latin alphabet. It is also used in other writing systems, such as Cyrillic, Arabic, and Hebrew. Z has various meanings and uses in mathematics, science, linguistics, and other fields. Learn more about the history, pronunciation, and symbolism of Z on Wikipedia.

5. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

6. D - Wikipedia

   en.wikipedia.org/wiki/D

   In the hexadecimal (base 16) numbering system, D is a number that corresponds to the number 13 in decimal (base 10) counting. [8] The Roman numeral D represents the number 500. [9] Unit prefix d, meaning one tenth. D is the grade below C but above E/F in the school grading system.

7. List of presidents of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_Presidents_of_the...

   Near the end of his presidency, Johnson rejoined the Democratic Party. [42] ^ Chester A. Arthur succeeded to the presidency upon the death of James A. Garfield. [47] ^ Theodore Roosevelt succeeded to the presidency upon the death of William McKinley. [52] ^ Calvin Coolidge succeeded to the presidency upon the death of Warren G. Harding.