(astronomy) a type of active galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae

(computing) An object in programming that provides an abstract interface to some type of persistence mechanism, providing some specific data operations without exposing details of the persistence layer.

plural of data access object

plural of trans-Neptunian object

(software) An individual database in the versioning software ClearCase.

(architecture, computing, design) A behavioural design pattern that describes the uses of null objects and their behavior (or the lack of them).

plural of third-class object

plural of second-class object

plural of first-class object

(programming, languages) An entity that can be constructed at run-time, passed as a parameter, returned from a function, or assigned into a variable.