TriangleMarker

$(function() {
    $("#circularGauge").dxCircularGauge({
        value: 40,
        valueIndicator: { // or subvalueIndicator
            type: "triangleMarker",
            // The rest of the indicator properties go here
        }
    });
});

<template>
    <DxCircularGauge :value="40">
        <DxValueIndicator <!-- or DxSubvalueIndicator -->
            type="triangleMarker"
            <!-- The rest of the indicator properties go here -->
        /> 
    </DxCircularGauge>
</template>

<script>
import DxCircularGauge, {
    DxValueIndicator
} from 'devextreme-vue/circular-gauge';

export default {
    components: {
        DxCircularGauge,
        DxValueIndicator
    }
}
</script>

import React from 'react';

import CircularGauge, {
    ValueIndicator
} from 'devextreme-react/circular-gauge';

class App extends React.Component {
    render() {
        return (
            <CircularGauge value={40}>
                <ValueIndicator {/* or SubvalueIndicator */}                        
                    type="triangleMarker"
                    {/* The rest of the indicator properties go here */}
                />
            </CircularGauge>
        );
    }
}
export default App;

@(Html.DevExtreme().CircularGauge()
    .ID("circularGauge")
    .Value(40)
    .ValueIndicator(vi => vi // or .SubvalueIndicator
        .Type(GaugeIndicatorType.TriangleMarker)
        // The rest of the indicator properties go here
    )
)