bodyCells[k].setAttribute("data-title", * * array[i][m] * * );
To me, both
* * don't look quite right in this context. Are either or both correct? If so, what is the meaning?
** is NOT used for exponents. In fact, Math.pow() seems to be the function of choice for exponents. So it seems to have nothing to do with that.
As of ECMAScript 2016,
Those would both be syntax errors. It is perhaps an attempt to use Markdown style for bold text (i.e.
However, in this case, the action seems to be intended to make that text bold.