Even I am hearing this term "Severance package" for the first time.
After looking up for the meaning of this
word, I can to the same defination as Ulf mentioned.
Very few companies in India would be offering this kind of a component in the salary package. I have heard of performance bonus, loyalty bonus, but never heard of severance package.
What the company usually do is that the company would pay one month salary if they are laying off a employee.