Attestations
In chapter 35 of the Prose Edda book Gylfaginning, High provides brief descriptions of 16 ásynjur. High lists Syn eleventh, and details that she "guards the doors of the hall and shuts them against those who are not to enter". High additionally states that Syn is "appointed in defense" at things "in legal matters in which she wishes to refute" and that her name is connected to a saying where "a denial (syn) is made when one says no."
In the Prose Edda book Skáldskaparmál, Syn is included among a list of 27 ásynjur names. Syn also appears in two kennings used in works recorded in Skáldskaparmál; once for "jötunn" ("hearth-stone-Syn") in Þórsdrápa by Eilífr Goðrúnarson, and for "woman" ("Syn of soft necklace-stand ") in a work attributed to Steinar.
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