(in game theory) a scenario in which the outcome of one person's decision is determined by the simultaneous decisions of the other participants, resulting in a bad outcome for all of them if all act in their own self-interest.
What’s The #’s Real Name?A hash has referred to stripes on military jackets since as early as 1910. But, in the 1980s, people started using hash to refer to the # symbol.
Origin of prisoner's dilemma
from a dilemma in which partners in crime must decide whether to confess, without knowing each other's decision
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019