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.
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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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