Three planets around TRAPPIST-1 were first discovered and designated b, c and d in order of increasing orbital periods, and the second batch of discoveries was similarly designated e to h.
Tres dos planetas ó redor de TRAPPIST-1 foron descubertos primeiro e designados b, c e d en orde crecente dos seus períodos orbitais, e o segundo grupo descuberto designouse do mesmo xeito de e a h.