1. The exclamation mark (!) is known as a 'bang' in printer's jargon.
2. The inverted exclamation mark (¡) is used in Spanish before exclamatory phrases.
3. The question mark (?) is believed to have been invented by Alcuin of York, an English scholar, in the 8th century.
4. In programming languages, the exclamation mark can be used to represent the 'not' operator.
5. The inverted question mark (¿) is also used in Spanish before interrogative sentences.
6. In typography, the exclamation mark and question mark are often referred to as 'interrobangs' when used together.
7. The exclamation mark is commonly used in writing to indicate emphasis or surprise.
8. The inverted exclamation mark is unique to the Spanish language and is not used in other languages.
9. The question mark is used to denote a query or uncertainty in a sentence.
10. The exclamation mark is often used in mathematics to represent the factorial of a number.
11. The inverted exclamation mark is part of the official Spanish language alphabet.
12. The question mark is believed to have evolved from the Latin word 'quaestio' meaning question.
13. The exclamation mark was first used in English printing in the 15th century.
14. The inverted question mark is used in some other languages like Galician and Waray-Waray.
15. The exclamation mark is sometimes used in informal writing to denote sarcasm or irony.