What does Y stand for?

What does Y mean?

Y	Alleghany Corporation of Delaware Business » NYSE Symbols
Y	Contrast (gamma) Miscellaneous » Photography
Y	Contrast (gamma) (photography) Community » Media
Y	Out-of-plane Position - vertical Academic & Science » Physics
Y	Search and Rescue Unit Error Governmental » Military
Y	Subsampled raw YUV file Bitmap graphics Computing » File Extensions
Y	Vertical axis Academic & Science » Physics
Y	Vertical axis (plotter Y-axis) Computing » Hardware
Y	vertical axis (Y-axis) Academic & Science » Mathematics
Y	Why Computing » Texting
Y	Why? Internet » Chat
Y	Width of vehicle or structure - Horizontal Axis Governmental » NASA
Y	Y-axis Governmental » NASA
Y	Ya Miscellaneous » Unclassified
Y	YACC Grammar file Computing » File Extensions
Y	Yak Miscellaneous » Unclassified
Y	Yard Miscellaneous » Unclassified
Y	Yaw Miscellaneous » Unclassified
Y	Yaw Governmental » NASA
Y	Years Miscellaneous » Unit Measures
Y	Yelling Community » Educational
Y	Yen Miscellaneous » Unclassified
Y	Yes Miscellaneous » Unclassified
Y	YES International
Y	Yesterday Miscellaneous » Days Abbreviations