2 is a number in the Arabic Numeral System—the most widely used numeral system in the world. Along with the letters E, S, W and the number 3, the number 2 sponsored the first episode of Sesame Street. Furthermore, the number 2, along with the letter D, sponsored the first Sesame Street test show.

In the first episode of Sesame Street, Ernie revealed that his favorite number was 2.

In the Dinosaurs episode "Baby Talk", a law is passed which includes changing the number 2 to "Not 1".

Songs about 2

• "Doll House"
• "I've Got Two"
• "Jazz #2"
• "(A Monster Went and) Ate My Red Two"
• "One and One Make Two" (Ernie and Bert)
• "One Two Blues"
• "Pinball Number Count"
• "Two for Two"
• "Two Heads Are Better Than One" (Herry Monster and the Two-Headed Monster)
• "Two Princes"
• "Two Song (Song of Two)"
• "Two Toucan Two-Steps"

Skits about 2

• Ernie & Bert: Two of Everything
• Bert's Pigeon Call
• Grover Demonstrates the Number 2
• Kermit Draws the Number 2
• Harvey Kneeslapper's Pranks -- Harvey Kneeslapper and the pogo stick
• The Mad Painter #2
• The Number of the Day
• The Bellhop #2
• Professor_Hastings' 2 lecture
• Pizzeria Dos