FR
For real
Example
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Last Updated: August 6, 2013
For reference
A simple way to indicate a message or file is meant for reference purposes; may also be used when CCing people in an email.
Example
I've attached the latest design from our team. Please let me know what you think!"
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Last Updated: October 20, 2014
Fumble recovery
FR is a statistic in football that refers to the number of fumbles forced and recovered by a defense. The acronym is commonly used in fantasy football (FFB) as a category of points recorded by a defense.
Defenses are combined with ST to score points for a fantasy team. These defensive units can score points in a variety of ways, including recovered fumbles, interceptions, sacks, and touchdowns.
Example

ESPN fantasy football defensive stats
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Last Updated: October 25, 2016
An assertion of seriousness, whether it be in addition to a comment or a question of someone else's seriousness.