The vertical dashed lines coming down from the "instance : Object" boxes are called in UML lifelines they depicts the instance scope of existance.
The solid arrow with the caption "sum ( 2 , 5 )" depicts a function call. This kind of arrow is know in UML as Message Call.
The dashed arrow with the caption "7" is the return value from the function. This kind of arrow is know in UML as Message Return.
The vertical box is the body of the function sum.
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