"For Want of a Nail" may refer to:

* AlternateSelf: Another version of a character, often from a different timeline.
* AlternateUniverseFic: Applies when the AlternateUniverse is distinguished by changing an aspect of canon and following the consequences.
* ButterflyOfDoom: A tiny change in the timeline alters the future drastically for the worse.
* ContrivedCoincidence: Something that is statistically very unlikely facilitates specific plot points.
* IncitingIncident: The event that sets the plot in motion.
* InSpiteOfANail: The future that results from a change in the timeline still closely resembles the unchanged timeline.
* ItBeganWithATwistOfFate: A mundane decision begins the events of a story.
* PointOfDivergence: The point at which an AlternateHistory diverges.
* SplitTimelinesPlot: Multiple {{Alternate Timeline}}s shown in a story after a diverging event.
* UnwittingInstigatorOfDoom: The unlikely and/or meager actions of a single character cause a significant disaster.
* WhatIf: Changing an existing factor in a narrative to tell a new story.

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