Lamport timestamps and Vector clocks are concepts of the logical clocks in distributed systems.
Twelve O'Clock High | Synchronization | 12-hour clock | clock | Twelve O'Clock High (TV series) | Not the Nine O'Clock News | Doomsday Clock | CLOCK | My Grandfather's Clock | The 11 O'Clock Show | BBC Nine O'Clock News | Twist Around the Clock | The Elephant Man's Alarm Clock | Synchronization gear | Rock Around the Clock | One O'Clock Lab Band | Not the Nine O'clock News | Nine O'Clock News | Clock Tower | Clock of the Long Now | Clock | 24-hour clock | The Devil at 4 O'Clock | Swiss railway clock | Six O'Clock Rock | One O'Clock Jump | Jens Olsen's World Clock | It's Five O'Clock Somewhere | clock tower | Clock signal |