Other
- The Rolls-Royce Tay (turbojet), a turbobjet aircraft engine
- The later Rolls-Royce Tay (turbofan)
- The age Tay in the Myst series, primarily in the game Riven
- TaY, an abbreviation for Tampereen yliopisto (University of Tampere)
- TAY, IATA code for Tartu Airport
- TAY, ICAO abbreviation for TNT Airways
- Tay is an alternative pronunciation of tea, common in Ireland
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