SYN

Syn may refer to:

• Syn (goddess), in Norse mythology
• Syn addition, in organic chemistry
• The Syn, a band formerly including bassist Chris Squire of Yes
• Sýn, an Icelandic TV station
• Doctor Syn, a character in novels by Russell Thorndike
• Grand Admiral Peccati Syn character in the Star Wars expanded universe
• Synonym (taxonomy), a system of accepted alternative names for species
• Synyster Gates, the lead guitarist for Avenged Sevenfold
• DJ Synystr

SYN may refer to:

• SYN (TCP), synchronise packet in transmission control protocol (TCP)
• Synchronous idle (␖), one of the C0 and C1 control codes
• Synaspismós, the Coalition of the Left of Movements and Ecology, a Greek radical left political party
• Student Youth Network, a youth media organization based in Melbourne, Australia
• SYN (OSC), a standardized namespace within Open Sound Control (OSC)
• SYN (band), a band by Halca (singer)