# Half-life Unit Notations

I was looking for some element's half-life, on the following website:

http://nucleardata.nuclear.lu.se/toi/listnuc.asp?sql=&A1=214&A2=214&Z=88

For 214,88-Ra, the half-life is shown to be: 2.46 s 3

I am unsure what the "3" stands for, is it "$$\cdot 10^{-3}$$"?

Thank you for your help and time guys.