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The border of the icon.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  dataSource: {
    data: [{
      value: 1,
      noteText: "A"
    }]
  },
  series: [{
    field: "value",
    noteTextField: "noteText",
    notes: {
      icon: {
        border: {
          width: 2,
          color: "red"
        }
      }
    }
  }]
});
</script>

The border color of the icon.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  dataSource: {
    data: [{
      value: 1,
      noteText: "A"
    }]
  },
  series: [{
    field: "value",
    noteTextField: "noteText",
    notes: {
      icon: {
        border: {
          width: 2,
          color: "red"
        }
      }
    }
  }]
});
</script>

The border width of the icon.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  dataSource: {
    data: [{
      value: 1,
      noteText: "A"
    }]
  },
  series: [{
    field: "value",
    noteTextField: "noteText",
    notes: {
      icon: {
        border: {
          width: 2,
          color: "red"
        }
      }
    }
  }]
});
</script>