Original: Solitary confinement is colloquially referred to in American English as the ` hotbox ' , the ` hole ' , ` lockdown ' , the ` SHU ' ( pronounced ` shoe ' ) - an acronym for security housing unit , or the ` pound ' ; and in British English as the ` block ' or the ` cooler ' .
Simplified: In American English it also called the ` hole ' , ` lockdown ' , the ` SHU ' ( pronounced ` shoe ' ) or the ` pound ' . In British English people say ` block ' or ` the cooler ' .