Sign

Sign[x] returns the sign of x.

Attributes[Sign] := {Listable, NumericFunction, Protected, ReadProtected}

Simple examples

In[1]:= Sign[5]
Out[1]= 1

In[2]:= Sign[0]
Out[2]= 0

In[3]:= Sign[-5]
Out[3]= -1

In[4]:= Sign[5.]
Out[4]= 1

In[5]:= Sign[0.]
Out[5]= 0

In[6]:= Sign[-5.]
Out[6]= -1

In[7]:= Sign[(1)/(2)]
Out[7]= 1