Markers can automatically have numbered icons — so they marker automatically gets a number (1,2,3,4...) or letter (a,b,c,d...) depending on their order.
This is called Programmatic Icons.
To turn on Programmatic Icons, click the Customize tab and select Markers.
Then under Icon select Choose... and click the Programmatic A-Z 0-10 tab. Then you can choose whether you want Alphabetical or Numerical.
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