Sets the symbol used to display the specified attribute type
| attrType | string | "Loading", "Support", "Material", etc | 
| symbolName | string | name of symbol - one of "Asterisk", "Barred X", "Boxed cross", "Circle", "Cross", "Diamond", "Double triangle", "Horizontal Arrow", "Letter X", "Letter Y", "Letter Z", "Reverse arrow", "Square", "Triangle", "Vertical Arrow", "Vertical line" | 
| symbolSize | optional double | |
| symbolAngle | optional double | |
| Return value | none | 
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