Delay line memory, a form of computer memory used on some of the earliest digital computers
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Bi-directional delay line, a numerical analysis technique used in computer simulation for solving ordinary differential equations by converting them to hyperbolic equations
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Propagation delay, the length of time taken for something to reach its destination
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On PAL C64s, the PAL delay line in the monitor or TV which averages the color hue, but not the brightness, of consecutive screen lines can be used to create seven nonstandard colors by alternating screen lines showing two colors of identical brightness.
Most OEOs utilize the transmission characteristics of an optical modulator together with a fiber-optic delay line to convert light energy into stable, spectrally pure RF/microwave reference signals.
Sometimes they are cured using inductive delay-line elements to effectively increase the time duration of an input signal.