Mark is a practical figure - regular polygon.

Analyze Pentagram:

// x : central coordinate x value
// y : center coordinate y value
// n : number of star angles
// r : distance from center to concave point
// R : Center to vertex distance
// rotation : pre rotation angle
// color : fill color
// borderWidth : edge width
// borderColor : border color
// isFilled : fill or not
function CreatePolygonalStar(x, y, n, r, R, rotation, color, borderWidth = 0, borderColor = color, isFilled = true) {
    ctx.save();
    ctx.fillStyle = color;
    ctx.strokeStyle = borderColor;
    ctx.lineWidth = borderWidth;

    ctx.beginPath();
    for (var i = 0; i < n; i++) {
        var perDeg = 360 / n;
        var degA = perDeg / 2 / 2;
        var degB = 360 / (n - 1) / 2 - degA / 2 + degA;
        ctx.lineTo(Math.cos((degA + perDeg * i - rotation) / 180 * Math.PI) * R + (x - R) + borderWidth + R * Math.cos(degA / 180 * Math.PI),
                    -Math.sin((degA + perDeg * i - rotation) / 180 * Math.PI) * R + (y - R) + borderWidth + R);
        ctx.lineTo(Math.cos((degB + perDeg * i - rotation) / 180 * Math.PI) * r + (x - R) + borderWidth + R * Math.cos(degA / 180 * Math.PI),
                    -Math.sin((degB + perDeg * i - rotation) / 180 * Math.PI) * r + (y - R) + borderWidth + R);
            }
    ctx.closePath();

    ctx.stroke();

    if (!!isFilled) {
        ctx.fill();
    } else {
        ctx.stroke();
    }

    ctx.restore();
}

Draw 80 point star:

CreatePolygonalStar(100, 100, 80, 50, 90, 45, 'hsla(240, 80%, 60%, 1)')

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