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Definition of `*

I don know why having a hard time finding in the documentation what is the meaning of `* ? For example in
ClearAll ["`*"]; 
sometimes the aposthrophe is used alone.  HELP.
POSTED BY: Jose Calderon
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All the symbols in the current context.
 In[1]:= Context[]
 Out[1]= Global`
 
 In[2]:= q = 1;
 
 In[3]:= r = 2;
 
 In[4]:= q+r
 Out[4]= 3

In[5]:= ClearAll["`*"]

In[6]:= q+r
Out[6]= q + r

See tutorial/Contexts  in the (Help menu) Documentation Center or
http://reference.wolfram.com/mathematica/tutorial/Contexts.html  online.
POSTED BY: Bruce Miller
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