What is the meaning of round circle in er digram

StackOverflow https://stackoverflow.com/questions/22609774

  •  20-06-2023
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题

It has round circle in middle i am not getting the meaning of this circle..

enter image description here

有帮助吗？

解决方案

It seems to be a symbol for inheritance. Financial, physical, and information assets are all kinds of assets.

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