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Meanings and definitions for 504

Year 504 (DIV) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.
504, a year
Avro 504, a World War 1 era biplane aircraft built by A. V. Roe and Company,
Peugeot 504, a car
Area code 504
Section 504 of the Rehabilitation Act, which protects Americans with disabilities from discrimination by any entity that receives Federal funding.
HTTP status code 504
504 King, a streetcar route operated by the Toronto Transit Commission
No. 504 (County of Nottingham) Squadron, RAuxAF