A  First Order Entity is a kind of Ordered Entity that is not itself a class (Class of Entity): it cannot have instances. The " First Order Entity" class is the powerinstance of First Order Class. 

 First Order Entitys are the most common type of entities.

The word "Individual" is sometimes used to designate  First Order Entity. In  SysFEAT, the term Individual is reserved for  First Order Entitys that have a spatio-temporal extent.

Examples:

. The set of numbers {1,2,3,4}.

. The mathematical constant ? (pi).

. The English word "Tree" (as a specific string of characters in a specific language).

. The Eiffel tower (31st March 1889 - ...).

. Mount Vesuvius eruption (Aug. 24-25, A.D. 79).