European eXPErimental Re-entry Testbed
European eXPErimental Re-entry Test-bed (EXPERT) was a European Space Agency aerothermodynamics research programme. It was planned that vehicle will be launched on a Russian Volna launch vehicle and will provide knowledge and experience in the design and development of re-entry vehicles.
Source: Wikipedia — European eXPErimental Re-entry Testbed (CC BY-SA 4.0)