Activity Diagram Symbol	Use
filled circle	initial state
circle with dot inside	final state
rounded rectangle	action box
diamond	decision

Class Diagram Symbol	Use
italics and <<abstract>>	abstract class
<<interface>>	interface
+	public method
-	private method
#	protected method
~	package method
hollow arrow toward superclass	inheritance (is-a)
filled diamond on whole class	composition (has-a)
hollow diamond	whole class object can be destroyed without destroying associated objects
'n .. n' on association line	cardinality
dashed line and open arrowhead	implementation of an interface
closed hollow arrow	the class implements methods in the interface

Object Diagram Symbol	Use
'object : class' listed in first section	object identifier
': class'	anonymous objects have no object listed
attribute = value listed in second section	object's attributes and values
same symbols as in class diagram (line, hollow arrow, filled and hollow diamond)	links

Sequence Diagram Symbol	Use
lifeline	passage of time as it extends downward
person	entity that interacts with the system
rectangles	objects
box labeled in upper left corner	loops or sequence diagrams
variety of links	messages between objects
arrow with filled head	synchronous
arrow with open head	asynchronous
dashed arrow	return messages
<<create>> over a message	new object is created
'X' on lifeline	object destroyed

State Diagram Symbol	Use
rounded rectangle	state
filled circle	initial state
circle with dot inside	final state
arrow notation	triggers, events, or guard conditions
diamond	decision
circle with 'X' inside	escape from state machine due to error