Hello, everyone!
Today I'm going to introduce you DAYU
The relationship modeling in DAYU supports management relationships, such as one-to-one, one-to-many relationships, etc.

It uses IE notation (Information Engineering Notation), or Crow's foot notation (also Martin notation).
https://en.wikipedia.org/wiki/Entity–relationship_model#Crow's_foot_notation

For other notations, please refer to:
https://en.wikipedia.org/wiki/IDEF1X