5K

• 5-K

From 5 (“the number five”) +‎ K (“abbreviation for thousand”).

• Audio (Southern England):

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5K (plural 5Ks)

1. (athletics) A road race over 5 000 metres.
   • 2019 February 28, Lindsay Denninger, “Why You Might Be Wrong About Emma & Barbara Morgan On 'Million Little Things'”, in Bustle‎^[1], archived from the original on 29 March 2023:

     She stalked the family home to catch Sophie on a run, and then she lied and said she was a part of the 5K the family did in Jon's memory. Then, she wanted to leave a note (or maybe the memory card with that info on it) for Delilah, and then she chickened out. These aren't actions of a straight-thinking woman.

2. (computing) A display device or item of content with approximately 5,000 pixels in the horizontal axis.

When written in its expanded-out form, "5000 metres" typically denotes that the race is run on a track, as compared to , which denotes the race is run on a road.