It is a term used to describe repairs or enhancements made with any materials that are available at little or no cost. This is often done on a temporary basis, and usually without regard to appearance.
Some examples:
The term is probably derived from "nigg*r rigged" and can be offensive.
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The abbreviation of Engg. means Engineering.
see link below
Flow Line
This means a scientific achievement, or hypothesis.
constraint is a limit to design process and criteria is want