These are decimal numbers, and dots above some of the digits make them recurring decimals. One dot means the digit under it repeats infinitely. In other words, it goes on forever (and ever and ever).

I did a Q&A this week at the website io9, and one of the questions was something I get all the time: How can you add up a series of infinitely many numbers and get a finite answer? This question has ...

Solidigm, an American data storage company, has set a new world record by decoding approximately 105 trillion decimal places of Pi, a remarkable feat. Pi has an infinite number of non-repeating ...