Polygon types

"In geometry a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain or circuit. These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices (singular: vertex) or corners. The interior of the polygon is sometimes called its body. An n-gon is a polygon with n sides. A polygon is a 2-dimensional example of the more general polytope in any number of dimensions. ...
The basic geometrical notion has been adapted in various ways to suit particular purposes. Mathematicians are often concerned only with the bounding closed polygonal chain and with simple polygons which do not self-intersect, and they often define a polygon accordingly. A polygonal boundary may be allowed to intersect itself, creating star polygons. Geometrically two edges meeting at a corner are required to form an angle that is not straight (180°); otherwise, the line segments may be considered parts of a single edge; however mathematically, such corners may sometimes be allowed. These and other generalizations of polygons are described below." [Polygon. Wikipedia]
The geometry diagram example "Polygon types" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Mathematics solution from the Science and Education area of ConceptDraw Solution Park.

The vector stencils library "Activities BPMN 1.2" contains 16 activity symbols for drawing business process diagrams (Business Process Model and Notation) using the ConceptDraw PRO diagramming and vector drawing software.
"An activity is represented with a rounded-corner rectangle and describes the kind of work which must be done.
Task.
A task represents a single unit of work that is not or cannot be broken down to a further level of business process detail without diagramming the steps in a procedure (which is not the purpose of BPMN).
Sub-process.
Used to hide or reveal additional levels of business process detail. When collapsed, a sub-process is indicated by a plus sign against the bottom line of the rectangle; when expanded, the rounded rectangle expands to show all flow objects, connecting objects, and artifacts.
Has its own self-contained start and end events; sequence flows from the parent process must not cross the boundary.
Transaction.
A form of sub-process in which all contained activities must be treated as a whole; i.e., they must all be completed to meet an objective, and if any one of them fails, they must all be compensated (undone). Transactions are differentiated from expanded sub-processes by being surrounded by a double border.
Call Activity.
A point in the process where a global process or a global Task is reused. A call activity is differentiated from other activity types by a bolded border around the activity area." [Business Process Model and Notation. Wikipedia]
The shapes example "Design elements - Activities BPMN 1.2" is included in the Business Process Diagram solution from the Business Processes area of ConceptDraw Solution Park.