Sid or SID may refer to: People. Sid (given name), includes a list of people with the name. Science and technology. Sound Interface Device: the MOS Technology 6581 sound-generating chip used in some Commodore computers. Security Identifier, used by Microsoft. Sid blood group system. Saab Information Display in cars. Slew-induced distortion, in an amplifier. Source to image-receptor distance, in radiology. Sudden ionospheric disturbance, caused by a solar flare. Surface-induced dissociation, in mass spectrometry. System identification number, in wireless telephony.
https://en.wikipedia.org/wiki/SID