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- Y2Ti2O7 1
- Y3Al5O12 2
- Y3Al5O12 : Tb 1
- Y3OF3S2:Ce3(3+) 1
- YACC 1
- Yaeyama Islands 1
- YAFFS 1
- YAG 3
- YAG : Cr phosphors 1
- Yagi 1
- Yagi Antenna 1
- Yagi antenna 1
- Yagi-Uda 1
- Yagi-Uda antenna 1
- Yagi-Uda nanoantennas 1
- Yahoo 3
- Yahoo news 1
- Yahoo! 2
- Yahoo! Answer Taiwan 3
- Yahoo！奇摩 1