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Text
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Contains comments relevant for the diagram. Is not connected to any other symbol.
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Comment
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Contains comments relevant for a part of the diagram. Is connected to a symbol, a message sending or a message reception.
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Instance head
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Represents an instance of something that can communicate by sending and receiving messages. The "start symbol" for a created or an already existing instance.
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Instance end
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Used for graphically ending an instance axis without terminating the represented instance.
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Message
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Represents a signal sending from one instance to another. Is connected to at least one instance axis. Usually connected to an instance axis in both ends.
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Condition
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Represents a system or process state, or indicates that a certain condition is true. Contains a name of the represented state or condition. Is initially connected to one instance axis, but should often be connected to all.
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Timer
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Represents the use of a timer in an instance. Is connected to an instance axis. One symbol represents both a timer set and either a timeout or a reset.
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Action
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Is a kind of text symbol and is connected to an instance axis. Describes something that is happening in the instance.
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Create process
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Describes the creation of an instance. The arrow should go from an instance axis (the creator) to an instance head (the creator instance). The instance head is created when the create process symbol is initially laid out.
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Process stop
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Terminates an instance. The instance ceases to exist. Is connected to an instance axis.
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Coregion
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Creates a part of an instance axis where the order of received and sent signals is undefined. Is connected to an instance axis.
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MSC reference
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References another MSC or HMSC diagram in the same group of MSC diagrams. Contains the name of the other diagram. Is initially connected to one instance axis, but can be connected to several.
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Inline expression
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Is used for specification of alternative or optional parts (that is, message sending sequences) which are contained in the symbol. Is initially connected to one instance axis, but should most likely be connected to several.
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Inline expression separator
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Creates a new partition in an inline expression symbol. Initially, the inline expression symbol only contains one partition.
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