gimble-lock
n.— «Its also interesting to note that a rotating disk produces what is commonly known as 1-axis “gimble-lock.” However, the coupling of two counter-rotating disks causes this “gimble-lock” effect to completely vanish!» —“Towards a new test of general relativity?” by William S. Alek ZPEnergy.com Mar. 26, 2006. (source: Double-Tongued Dictionary)