(astronomy) A type of trans-Neptunian object (TNO) (a certain type of minor planet) that has an orbit in the Kuiper belt (between 30-50 AU) with inclinations consistent with the ecliptic.

(astronomy) A small Solar System body (ie. asteroid, comet, or large meteoroid) whose orbit brings it into proximity with Earth's orbit.

(astronomy) a small, bright knot of nebular emission in a dark, interstellar cloud of gas and dust; thought to be mass ejected from a young star

(Internet) A cross-platform, language-independent convention for representing and interacting with objects in HTML, XHTML and XML documents.

(programming) A programming paradigm that uses "objects" to design applications and computer programs.

Alternative spelling of object-oriented programming

(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.

(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).