BLACK FIVE
  1. a heavily occluded case characterized by mental pictures consisting of masses of blackness. This is a "step V" in early procedures such as Standard Operating Procedure 8. (PXL, p. 141)
  2. a level of nonperception, whether the person is seeing blackness or invisibility. (SH Spec 271, 6305C20)
  3. a no-responsibility case. (COHA, p. 161)


Technical Dictionary