Can anyone tell me what does the period symbol represent in this context?


  • $\begingroup$ Doesn't look like standard notation, but I guess it indicates multiplication. Where did you see this? $\endgroup$
    – lulu
    Oct 23, 2018 at 13:48
  • 1
    $\begingroup$ Multiplication. $\endgroup$
    – Berci
    Oct 23, 2018 at 13:49
  • $\begingroup$ I saw it on this site in the solution to the following problem brilliant.org/problems/6s-problem-6/#!/solution-comments $\endgroup$ Oct 23, 2018 at 13:50

1 Answer 1


That dot is a multiplication symbol. It's relatively standard in some parts of the world (I've seen it used on Numberphile from time to time, for instance) to use a lower $.$ rather than a centered $\cdot$


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