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Joy is a great feeling of happiness.
1960s era fonts were often used in slogans which promoted peace, love, and joy rather than war. The war between the USA and Vietnam went from Nov 1, 1955 to Apr 30, 1975.
The peace, love, and joy phrase was used by Hippies, short for hipsters, a subculture which began in the 1950s beatnik coffee house scene predominately in San Francisco. Hippies continue to exist today with new generations of liberal minded activists who believe in peace, love, and joy.