Aboriginal traditional knowledge and science in sustainable cultural and natural heritage development. Triple bottom line. Graphic describing the three types of bottom lines Triple bottom line (abbreviated as TBL or 3BL) incorporates the notion of sustainability into business decisions. The TBL is an accounting framework with three dimensions: social, environmental (or ecological) and financial. The TBL dimensions are also commonly called the three Ps: people, planet and profits and are referred to as the "three pillars of sustainability. " Interest in triple bottom line accounting has been growing in both for-profit, nonprofit and government sectors. Membership Categories. Can't wait forever. Respect first.