Operators
 + LINETO
 + ARC
 + SETLINEWIDTH ... Set Line Width
 + SETDASH ... Drawing Dotted Line / Broken Line
 + IMAGE ... Drawing Bitmap Images

Operators -- CAD
 + Visible/Hidden/Centre Line

 + RECTANGLE
 + SQUARE
 + CIRCLE
 +- CYLINDER
 +- DISC

 + DT ... Drilled through hole
 + TH-M3 ... Threaded hole for M3 screws
 + SF-M3 ... Spot-facing (SF) holes for M3 cap screws

Examples -- Math
 + SIN
 + COS
 + Parametric :: Asteroid
 + Polar :: Folium

Examples -- Structural Formula
 + BENZENE