PC - I found this link that describes them as fret markers
"Fret markers: Fret markers are the dots on the fretboard. They make it easier for you to spot which fret is which farther up the neck. Ukuleles have fret markers on the 5th, 7th and 10th frets (and also at the 12th and 15th if the fretboard extends that far). "
Ned - thank you
Ai - thank you