Index can have the following meanings:

• An index (pl. indices, sometimes indexes) is a pointer (literally - note that the index finger is the one which points, or indicates) that takes you to information.
• The city -- Index, Washington, United States
• Publishing purposes; see Index (publishing)
• Information Technology (IT) purposes; see Index (information technology) or Index (database)
• Mathematics; see Index (mathematics)
• Economics and Finance; see Index (economics)
• In Religion and Political Ideologies, see Index (ideologies)