However, the use of the word "clock" in this sense is different from the typical sense of a clock as a device that keeps track of time-of-day; the clock signal simply signals the start and/or end of some time period, often very minute (measured in microseconds or nanoseconds), that has an arbitrary relationship to sidereal, solar, or lunar time, or to any other system of measurement of the passage of minutes, hours, and days.
Međutim upotreba reči “sat” u ovom smislu se razlikuje od upotrebe reči sat kao uređaja koji meri dnevno vreme; “satni” signal jednostavno označava početak i/ili kraj izvesnog vremenskog perioda, često veoma kratkog (izraženog u mikro sekundama ili nano sekundama), koji ima proizvoljan odnos prema zvezdanom, solarnom ili mesečnom vremenu ili prema bilo kom drugom sistemu merenja prolaska minuta, sati i dana.