Interlocked Triangles consist of two adjacent Triangles, whose Centermost dancers are working with the furthest Outside dancers in a Triangle.
Examples of (symmetric) Interlocked Triangles: 
dancers work together in one Triangle as the dancers work together in another Triangle.
In general, Interlocked formation means that (viewing the formation along its long axis) one plane of dancers from each of two formations is interspersed with the other formation.
From a Galaxy in which the Centers are nonTBone, there are both Interlocked WaveBased Triangles and Interlocked TandemBased Triangles.
 

See also Interlocked 3 By 1 Triangles [C2].