D Flip Flop Synchronous

synchronous
(of a satellite or its orbit) Making or denoting an orbit around the earth or another celestial body in which one revolution is completed in the period taken for the body to rotate about its axis
Existing or occurring at the same time
occurring or existing at the same time or having the same period or phase; "recovery was synchronous with therapy"- Jour.A.M.A.; "a synchronous set of clocks"; "the synchronous action of a bird's wings in flight"; "synchronous oscillations"
At the same time, at the same frequency
(digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions

flip flop
A light sandal, typically of plastic or rubber, with a thong between the big and second toe
An abrupt reversal of policy
a backless sandal held to the foot by a thong between the big toe and the second toe
interchange: reverse (a direction, attitude, or course of action)
reversal: a decision to reverse an earlier decision
A backward handspring