What do these symbols mean?

Both are the exponent sign. 10**2 = 10x10 = 100. In the pension thread I had it as part of the equation for discounting future values, for example discounting 3 years at 4% as (1.04^3) which is 1.04 to the 3rd power or 1.04*1.04*1.04 or 1.124864.
 
The ** symbol for exponentials is not limited to Fortran. I programmed in SAS for 23 years and that was how I indicated raising a number to a power.
 
The asterisk may also be a replacement character inserted by the forum software in lieu of four letter words :)
 
And the ** was used in lieu of the caret (^) in the olden days when the caret was not generally available. And just for a little nostalgia, there was a time when some character sets DID NOT HAVE LOWER CASE.
 
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