code: def trefoil(R=1):
      p = figure(
          x_range=(-6 * R, 6 * R),
          y_range=(-6 * R, 6 * R),
          frame_width=500,
          frame_height=500,
          background_fill_color="yellow",
          title=Title(
              text="Radiation Warning Symbol (Trefoil)",
              align="center",
              text_font_size="20px",
          ),
          x_axis_type=None,
          y_axis_type=None,
          toolbar_location=None,
      )
  
      p.annular_wedge(
          x=0,
          y=0,
          inner_radius=1.5 * R,
          outer_radius=5 * R,
          start_angle=[0, 120, 240],
          end_angle=[60, 180, 300],
          start_angle_units="deg",
          end_angle_units="deg",
          line_color="black",
          fill_color="magenta",
      )
      p.circle(
          x=0,
          y=0,
          radius=R,
          line_color="black",
          fill_color="magenta",
      )
  
      arc = p.arc(
          x=0,
          y=0,
          radius=5.3 * R,
          start_angle=[60, 120],
          end_angle=[120, 180],
          start_angle_units="deg",
          end_angle_units="deg",
          line_color="black",
      )
      arc.add_decoration(TeeHead(size=10), "start")
      arc.add_decoration(VeeHead(size=8), "start")
      arc.add_decoration(TeeHead(size=10), "end")
      arc.add_decoration(VeeHead(size=8), "end")
  
      x1, y1 = 5.5 * R * cos(radians(150)), 5.5 * R * sin(radians(150))
      p.text(
          x=[0, x1],
          y=[5.3 * R, y1],
          text=value(f"60{degree}"),
          text_baseline="bottom",
          text_align="center",
      )
  
      p.segment(
          x0=[0, R, 1.5 * R, 5 * R],
          y0=0,
          x1=[0, R, 1.5 * R, 5 * R],
          y1=[-4 * R, -2 * R, -3 * R, -4 * R],
          line_color="black",
          line_dash=value([3, 3]),
      )
  
      s = p.segment(
          x0=0,
          y0=[-2 * R, -3 * R, -4 * R],
          x1=[R, 1.5 * R, 5 * R],
          y1=[-2 * R, -3 * R, -4 * R],
          line_color="black",
      )
      s.add_decoration(TeeHead(size=10), "start")
      s.add_decoration(VeeHead(size=8), "start")
      s.add_decoration(TeeHead(size=10), "end")
      s.add_decoration(VeeHead(size=8), "end")
  
      p.text(
          x=0.5 * R,
          y=-2 * R,
          text=value("R"),
          text_baseline="bottom",
          text_align="center",
      )
      p.text(
          x=0.5 * 1.5 * R,
          y=-3 * R,
          text=value(f"1.5{cdot}R"),
          text_baseline="bottom",
          text_align="center",
      )
      p.text(
          x=0.5 * 5 * R,
          y=-4 * R,
          text=value(f"5{cdot}R"),
          text_baseline="bottom",
          text_align="center",
      )
  
      return p
  
imports: from math import cos, radians, sin
  from bokeh.core.properties import value
  from bokeh.models import TeeHead, Title, VeeHead
  from bokeh.plotting import figure, show
label_desc: Use image node_id 1 for calling a global function with example usage: trefoil(R) and returns: p