The President's Pleasure (Singapore)

The President's Pleasure (TPP) in Singapore was a practice of indefinite imprisonment formerly applied to offenders who were convicted of capital offences (most notably murder and drug trafficking) but were below the age of 18 at the time of their crimes. Such offenders were not sentenced to death in accordance with the death penalty laws in Singapore; they were instead indefinitely detained by order of the President of Singapore.

Source: Wikipedia — The President's Pleasure (Singapore) (CC BY-SA 4.0)