It's effectively a line number.
In
is an array of all of the inputs you have entered during a session, and Out
is a dictionary of the results from the corresponding inputs. You can use these to reference previous inputs and results; for example:
In[1]: 0x7b
Out[1]: 123
In[2]: 0x1c8
Out[2]: 456
In[3]: Out[1] + Out[2]
Out[3]: 579
In[4]: In
Out[4]: ['', '0x7b', '0x1c8', 'Out[1] + Out[2]', 'In']
In[5]: Out
Out[5]: {1: 123,
2: 456,
3: 579,
4: ['', '0x7b', '0x1c8', 'Out[1] + Out[2]', 'In', 'Out']}
Simply speaking it is the total number of times you have runned the cells and that number on a particular cell in "In[num]" is the number at which you runned that cell latest. hope it helps.
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