patternfly
diff --git a/packages/patternfly-4/react-charts/src/components/ChartPoint/ChartPoint.tsx b/packages/patternfly-4/react-charts/src/components/ChartPoint/ChartPoint.tsx
@@ -80,7 +80,7 @@ export interface ChartPointProps {
    * the point should render
    */
   symbol?: 'circle' | 'diamond' | 'plus' | 'minus' | 'square' | 'star' | 'triangleDown' | 'triangleUp' | 'dash' |
-    Function;
+    'threshold' | Function;
   /**
    * A transform that will be supplied to elements this component renders
    */
@@ -122,7 +122,8 @@ export const ChartPoint: React.FunctionComponent<ChartPointProps> = ({
       plus: PathHelpers.plus,
       minus: PathHelpers.minus,
       star: PathHelpers.star,
-      dash: PathHelpers.dash
+      dash: PathHelpers.dash,
+      threshold: PathHelpers.threshold
     };
     const symbol = Helpers.evaluateProp(props.symbol, datum, active);
     const symbolFunction = typeof pathFunctions[symbol] === 'function' ? pathFunctions[symbol] : pathFunctions.circle;

diff --git a/packages/patternfly-4/react-charts/src/components/ChartPoint/path-helpers.ts b/packages/patternfly-4/react-charts/src/components/ChartPoint/path-helpers.ts
@@ -119,5 +119,24 @@ export const PathHelpers = {
       v-${lineHeight}
       h-${distance}
       z`;
+  },
+
+  threshold(x: number, y: number, size: number) {
+    const baseSize = 1.1 * size;
+    const lineHeight = baseSize - baseSize * 0.3;
+    const x0 = x - baseSize;
+    const y1 = y + lineHeight / 2;
+    const distance = (x + baseSize - x0) * 0.5;
+    const padding = distance / 3;
+    return `M ${x0}, ${y1}
+      h${distance}
+      v-${lineHeight}
+      h-${distance}
+      z
+      M ${x0 + distance + padding}, ${y1}
+      h${distance}
+      v-${lineHeight}
+      h-${distance}
+      z`;
   }
 };