halo orbit
periodic, three-dimensional orbit near the L1, L2 or L3 Lagrange points in the three-body problem of orbital mechanics
near-rectilinear halo orbit
periodic, three-dimensional circuit near the L1 Lagrange point in the three-body problem
periodic, three-dimensional orbit near the L1, L2 or L3 Lagrange points in the three-body problem of orbital mechanics