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That which is "Lindy" is what ages in reverse, i.e., its life expectancy lengthens with time, conditional on survival.

Only the nonperishable can be Lindy. When it comes to ideas, books, technologies, procedures, institutions, and political systems under Lindy, there is no intrinsic aging and perishability.

Lindy is a deli in New York, now a tourist trap, that proudly claims to be famous for its cheesecake, but in fact has been known for fifty or so years by physicists and mathematicians thanks to the heuristic that developed there. Actors who hung out there gossiping about other actors discovered that Broadway shows that lasted for, say, one hundred days, had a future life expectancy of a hundred more. For those that lasted two hundred days, two hundred more. The heuristic became known as the Lindy effect.