"I never think of medal counts or anything", she said after winning her record-tying 23rd and record-extending 17th gold in the vault final on Saturday, the penultimate day of worlds.
At 22, she is doing more hard gymnastics than she did in sweeping to five Olympic medals, four of them gold, at the 2016 Rio Games when she was 19.
Team-mate Jade Carey claimed silver with Team GB's Ellie Downie taking the bronze.
Biles had the opportunity to take the record outright in the uneven bars final but could only place fifth in an event won by Derwael Nina.
Biles retained the vault title she won in Doha previous year by excelling on her two attempts, completing two and a half twists on her second effort.
Still, she hinted the Biles will be back in time for next year's Olympics in Tokyo. Countrywoman Sunisa Lee took silver, a full point behind.
That took Biles to 23 career world championship medals, equalling the mark set by Belarusian Vitaly Scherbo for any gymnast, male or female. However, Scherbo had competed in two more events than Biles.
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Petrounias, the 2016 Olympic champion and a three-time world gold medallist, finished just off the podium, only 0.2 points back. The "Biles" was named after she completed the double-double tuck, or two flips and two twists, dismount during her balance beam routine.
Sherbo earned his medals over the course of six years.
"I knew going into today there was a very slim chance that I would even medal, but to make a bar final and get to represent the country, I feel really proud because this is not one of my strong suits".
"I was just so happy to stick my vaults and crossing my fingers, it's insane to win a worlds medal after a rollercoaster of a week", she said. "I think about my performances and then... dinner".
Britain's double Olympic champion Max Whitlock won his third title in the event, adding to his 2015 and 2017 victories. Xiao Ruoteng of China took bronze with 14.933.
Lee Chih-Kai took silver for Taiwan on 15.433, while Rhys McClenaghan won the bronze on 15.4 as the first Irish gymnast ever to compete in a world championship final.
Ibrahim Colak won on rings for Turkey with 14.933, beating Italy's Marco Lodadio and French bronze medalist Samir Ait Said.
"This was such an incredible week", the 19-year-old Derwael said.