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I've been trying to figure out what this certain UML symbol means.


Seems to be called "containment" in visual paradigm


It is only used in design diagrams (as far as I know). I've got UML distilled (3rd edition), but that too doesn't explain what this is. Searching around the web gave me some meager results as well.

Does anyone know what this particular association is?

  • What diagram type is this on? – Thomas Owens May 23 '18 at 15:49
  • Design diagram, stupid of me not to add that to the topic. – CCG May 23 '18 at 15:51
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    I use Visual Paradigm, but I don't know what this "design diagram" is. You mention UML. Is it a class diagram? Object diagram? Something else? – Thomas Owens May 23 '18 at 15:55
  • Sorry, it's a class diagram. We were taught to call it design since it is the next step after an analysis diagram – CCG May 23 '18 at 16:00
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    Since you found an answer, I probably won't dig deeper. However, you should post the answer as an answer and not an edit to the question. Self-answering is acceptable and recommended for situations like this! – Thomas Owens May 23 '18 at 16:06
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After searching for something completely irrelevant (Googled "uml triangle"), I stumbled upon this:

enter image description here

while meaning to find something like this, which is an Association Pointer:

Association pointer

In obsolete UML 1.4.2, a declaring class and a nested class may be shown connected by a line with an "anchor" icon on the end (a cross inside a circle) connected to a declaring class (namespace).

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