Click Display symbols and connections > Display connections. The corresponding dialog opens.
Enter the first characters in the Enter text to filter field to reduce the amount of connection types displayed.
Move the mouse cursor in the Abbreviation for connection column over the connection you want to specify an abbreviation for and click Rename.
Enter a letter, a number, or a special character as a code.
This connection type will no longer be represented by a check mark in the matrix model, but by the character. If multiple connections are defined between objects, this is indicated by an asterisk in the cell in the matrix model. In a matrix model, connections are created at definition level only.
Click Apply.
You have specified abbreviations for connections in a matrix model.