n the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
n a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism
n a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm
true hackers subscribe to a code of ethics and look down upon crackers