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S3
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[[File:Airmen perform flight medicine exams 120502-F-YG608-005.jpg|300px|thumb|right]]
'''S3''' is the third heart sound, the "ta" of "lub-dub-ta," or the "na" of "[[Anatomy of the Female Reproductive System|vagina]]."<ref>[http://gomerblog.com/2015/12/heart/ Physical Exam Tips: The Heart(Gomerblog)]</ref><ref>[http://gomerblog.com/2016/11/heartbeats-dr-dre/ Product Review: Heartbeats by Dr. Dre Stethoscopes (Gomerblog)]</ref> An '''S3''' is known as the Kentucky [[Gallops|gallop]], which is named after the [[Barrett's Esophagus|Kentucky Derby]].