RLV Technology Demonstration Programme
Reusable Launch Vehicle–Technology Demonstration Programme is a series of technology demonstration missions that has been conceived by ISRO as a first step towards realising a Two Stage To Orbit (TSTO) reusable launch vehicle, in which the second stage is a spaceplane. For this purpose, a winged reusable launch vehicle technology demonstrator (RLV-TD) has been configured.
Source: Wikipedia — RLV Technology Demonstration Programme (CC BY-SA 4.0)