General fact: 525 is the number of scan lines in the NTSC television standard.
Mathematical fact: 525 is a hexagonal pyramidal number.
Trivia: 525 is the number of scan lines in the NTSC television standard.
Historical date: June 8th is the day in 1887 that Herman Hollerith applies for US patent #395,791 for the 'Art of Applying Statistics' – his punched card calculator.