Why are there more new words and new symbols that have emerged, adapted, used, and are intelligible by people with different native languages all over the world?

For example, the numbers (1,2,3), symbols (=,+,%), emoji and UFO, CEO, etc. 

In the 21st century, with the development of the internet, some new words and new symbols are emerging and spreading across the world in a universal form that could be understood by everyone who speaks different languages.