A "triple junction" refers to a point where three separate boundaries meet or intersect. It can apply to various fields, such as geography, geology, or even technology. Full definition
Lining the bellows shields with triple junction cells, energy production could be significant (up to about 15 % of the CSP capacity) but the LCOE was too high at about 15 cents per kWh. (solarpaces.org)
Power: Gallium Arsenide triple junction solar arrays, 10 kW at Earth and 1.4 kW at Ceres Orbit Altitude: At target asteroids: As high as 4,500 km and as low as 25 km Reliability: Redundant and cross-strapped spacecraft bus electronics Mission Life: 10 years (aerospaceguide.net)
The simulations can also explain how so - called triple junctions, i.e. zones in which three plates come together, are nucleated by multi-directional stretching of the lithosphere induced by plumes. (sciencedaily.com)