capacitance - µ in the Middle of a Capacitor Rating

I'm looking at an electrolytic capacitor (and old blue, Philips one used in electronics classes) and am wondering why it is printed with 4µ7-M.

I tried Googling, figuring that it was a common enough occurrence, but found nothing.

Is that supposed to be a 47µF cap? Why is the µ in the middle of the number? What is the -M for?

Thanks.

Answer

The "µ" symbol is put in place of the decimal point, 4µ7 translates to 4.7 µ farads.

Not too sure about the "-M" part tho - sorry