IdX

idx is a compact term that can refer to several distinct concepts across finance, media, and computing. The meaning depends on context, and there is no single universal definition.

Indonesian Stock Exchange (IDX)

IDX commonly denotes the Indonesia Stock Exchange, known in Indonesian as Bursa Efek Indonesia. The exchange was formed in 2007 from the merger of the Jakarta Stock Exchange and the Surabaya Stock Exchange. It operates the main market for equities, government and corporate bonds, and derivatives in Indonesia, and administers indices such as the IDX Composite (IHSG) and the IDX30. The exchange is overseen by the Financial Services Authority of Indonesia (OJK) and is a member of the World Federation of Exchanges. It provides trading platforms, clearing, and settlement services for listed securities and related financial instruments.

Subtitle and media indexing (idx/.sub)

In video and subtitle workflows, idx is often part of a pair with a .sub file. The .idx file is a plain-text index that provides timing and metadata for subtitle frames used by certain subtitle formats (notably VobSub). The accompanying .sub file contains the actual subtitle image data. Together, .idx and .sub enable display of graphical subtitles in multimedia players and authoring tools, with the .idx file guiding when each subtitle frame appears and for how long.

Programming and general usage

In computing, idx is a common variable name used to represent an index in loops or array Access patterns. It is a conventional shorthand rather than a formal keyword, and its exact usage varies by programming language and coding style. It often appears in example code and documentation as a succinct stand-in for an index value.