what is the category for expense approvals in approval and delegations

Summary:

I want to know which category is related to expense approvals in approvals and delegations.If i want to create approval delegation for expense approvals which category we have to select from the category list in approval delegation page.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):