A term used in The House of God and a skill utilized by the common sensical health care professional:
The two months... were to be spent on ward 4-South with Chuck and the resident, a shade named Leon. Leon, finishing two years in the House, had perfected the technique of the LP - Low Profile. Leon's profile was so low that no one saw him, ever. Having watched people screw up their life plans at the House by being visible, Leon had perfected invisibility.