There are attributes for which a default symbol is defined.
If such an attribute was specified and placed, for example, the Existence attribute, the As a symbol check box becomes available. If you enable the check box, a plus sign is placed in the model instead of Yes for the Existence attribute, and a minus sign instead of No.
Other attributes can be assigned attribute symbols for placement by a user with the Configuration administrator function privilege. This is done on the Administration tab in ARIS Architect.