The exclamation mark ! (also known as exclamation point in American English) is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings or to show emphasis. The exclamation mark often marks the end of a sentence, for example: "Watch out!".

The apostrophe (' ) is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet and some other alphabets. In English, the apostrophe is used for three basic purposes: It is also used in a few distinctive cases for the …

Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.

∞ is a symbol used to represent unending amounts. Either plus or minus depending on the situation. If y= [+|-]x then x is either positive or negative depending on the situation. y= [+|-]x y equals either +x or -x depending on the scenario.

As of Unicode version 16.0, there are 155,063 characters with code points, covering 168 modern and historical scripts, as well as multiple symbol sets.

Numbers that are larger than one million are usually either represented using scientific notation, or by words. [1] There are two main ways of using words to write large numbers. The American way or "Short form" for naming large numbers is different from the European way or "Long form" of naming large numbers.

This is a list of traditional abbreviations for U.S. states and territories. These abbreviations (short names) were used in mailing addresses before the introduction of two-letter U.S. postal abbreviations. The traditional abbreviations are still commonly used in …