SOS
An SOS was an ancient Earth term for a type of distress call. Simply Morse code for "S·O·S", this signal was displayed with the sound of three dots followed by three dashes followed by three more dots (···­­­ −−− ···). ()

In 2152, Hoshi Sato tried to get Jonathan Archer's attention by sending an SOS signal by manipulating a plasma circuit in his ready room while experiencing a hallucination during her first experience aboard a transporter. ()

In 2266, the  discovered an Earth-style SOS emanating from . The signal turned out to be automated. ()

In 2365, the  investigated an SOS distress call. This was sent out by the Mariposans due to severe flare activity. ()

In 2371, the  discovered an SOS signal emanating from a planet in the Delta Quadrant. It turned out to be from an ancient airplane, from Earth, that belonged to Amelia Earhart and Fred Noonan. ()

When Chief Miles O'Brien's engineering team were stranded on Empok Nor in 2373, Pechetti suggested using the space station's communication array to tap out an SOS to Deep Space 9. ()

Seven of Nine gave Jean-Luc Picard a calling card chip for the Fenris Rangers after their rescue of Bruce Maddox from Stardust City. () 

Picard had this chip on him when he transported aboard the  shortly afterward, but lost the chip there. Elnor would later find and activate the SOS while stranded on the Artifact after covering Picard's escape. ()

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