Residual value (of an asset) is the estimated amount that an entity would currently obtain from disposal of an asset, after deducting the estimated costs of disposal, if the asset were already of the age and in the condition expected at the end of its useful life.
Residual value (of an asset) is specifically discussed in IAS 16 Property, Plant and Equipment.
Source: Glossary of Terms of IFRSs as at 31 December 2008.