Y Yellow Y Yes Y Yttrium Y yellow Y yttrium Y y~ YAC yeast artificial chromosome YAC yeast artificial chromosomes YAG Yttrium aluminum garnet YAML YAML Ain't Markup Language YAML YAML Ain′t Markup Language YAML Yet Another Markup Language YANG Yet Another Next Generation YAP Yes Associated Protein YBCO yttrium barium copper oxide YBV Yug Bogdanovac virus YC yaw center YCG Yield Curve Generator YF Yellow Fever YFP Yellow Fluorescence Protein YFP Yellow Fluorescent Protein YFV yellow fever virus YGTSS Yale Global Tic Severity Scale YI Yellow Index YI Yellowness Index YIG yttrium iron garnet YL young leaves YLF yttrium lithium fluoride YMS yard management systems YN yttrium nitride YNB Yeast Nitrogen Base YO yttrium oxide YOAD youth-onset atypical diabetes YOLO You Only Look Once YOLO You-Only-Look-Once YPP yield per plot YR yaw rate YS Yield Strength YS Yield Stress YS yield strength YSZ Yttrium-stabilized zirconia YSZ yttria stabilized zirconia