In a UML diagram, what does a solid diamond indicate? UML diagram Commission +COMMISSION_RATE: double = 0.10

In a UML diagram, what does a solid diamond indicate?

UML diagram

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Commission +COMMISSION_RATE: double = 0.10 +addSales(sales: double): void Commissioned -sales: double = 0.0 +Commissioned(name: String) +addSales(sales: double): void +getPay(): double Salaried And Commissioned -sales: double +SalariedAndCommissioned( name: String, salary: double) +addSales(sales: double): void +getPay(): double Salaried2 -salary: double Employee2 -name: String +Employee2(name : String) +get Pay(): double +printPay (date: int) : void +Salaried2(name : String. salary: double) +getPay(): double Hourly2 -hourly Rate: double -hours: double = 0.0 +Hourly2(name : String. rate : double) +getPay(): double +addHours (hours: double): void Payrol13 +main (args: String[]): void