Using the Graphic Editors : Working with Charts and Diagrams : Activity Charts : Activity Chart Icons : Miscellaneous Icons

Miscellaneous Icons
 
Select Mode - places the editor in Select mode, so you can access the editing options the editor supports.
Create Data-Store - creates a data-store, which contains information on activities for later use. Data-stores can also be used to total large volumes of data, continuously accumulating over time.
Create Textual Note - creates free text that you can use to annotate the chart.
Create Combinational Assignment - creates a combinational assignment, which is the expression used to assign a value to a combinational element, with syntax like the following:
X := Y1 when C1 else
        Y2 when C2 else
         ...
         Yn
Combinational elements represent asynchronous behavior; they are elements whose value is assigned continuously (rather than evaluated once each step).