WSA

ESC is short for:

European Economic and Social Committee
Waterways and Shipping Offices in Germany
Vienna Final Act
Windows Sockets API ( Winsock), Microsoft Windows implementation of the Berkeley Sockets
Science currently ( wsa ), German news agency
Women's Squash Association, a professional association of female squash players
World Snooker Association
World Street Board Association, Association for the Advancement of Street Boarding
ESC, Austrian cycling team

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