A link somewhere on the internet brought you here.

It may refer to one of these tropes:
* FriendshipTrinket: An object that a character and/or their friend keep that symbolizes their friendship.
* TheLadysFavour: A (usually female) character gives a departing loved one an object of value to wish them good luck.
* MementoMacGuffin: A TragicKeepsake or FriendshipTrinket that plays an important role in the story.
* ThePromise: One or more characters make a promise to another. Often, an object is exchanged to symbolize that promise.
* ReunionVow: A character makes a promise to another that they'd meet again, often by leaving a personal memento as a security.
* ReturningTheHandkerchief: A character is determined to return an object that someone (usually a LoveInterest) had lent them.
* TragicKeepsake: Someone keeps a memento of a dead loved one to commemorate them.

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