2600

From Freepedia

• 2600 is a tetrahedral number, see 2000 (number)
• 2600 Hz is the tone used by a blue box to defeat toll charges on long distance telephone calls.
• 2600: The Hacker Quarterly is a magazine named after the above tone.
• The Atari 2600 was a popular video game console.
• The first year of the 27th century or the last year of the 26th century, depending on whether there is a year zero.