In addition to inserting math elements that are built in FrameMaker, you can insert custom math elements that have been defined for a document.
Custom math elements have no mathematical meaning in FrameMaker. For example, a custom math element for an operator is treated as an operator in an equation. However, FrameMaker cannot evaluate it.
On the Equations panel, choose Insert Math Element from the Equations drop-down list.
Select the element name and click Insert.