A sudden ionospheric disturbance (SID) is any one of several ionospheric perturbations, resulting from abnormally high ionization/plasma density in the D region of the ionosphere and caused by a solar flare and/or solar particle event (SPE).
Arabic honorific.
Neurodevelopmental condition involving heightened and/or muted responses to sensory input.
ID number used for user accounts and groups in Microsoft Windows.