What is 2nd called?

"2nd" is called "second" and is the ordinal number for the number 2, indicating position in a sequence.

Detailed Explanation:

Ordinal vs. Cardinal Numbers:

• Cardinal: 2 (two) - tells quantity
• Ordinal: 2nd (second) - tells position or order

Written Forms:

• Numeric: 2nd
• Written: second
• Abbreviation: 2ⁿᵈ (with superscript)

Usage in Mathematics:

• Fractions: "One-second" would be 1/2 (though we say "one-half")
• Sequences: The second term in a series
• Powers: "Two to the second power" = 2² = 4
• Derivatives: Second derivative in calculus

Common Uses:

• Ranking: "finished in 2nd place"
• Time: "2nd of March"
• Lists: "the 2nd item"
• Addresses: "2nd Street," "2nd Floor"

Related Ordinals:

• 1st (first)
• 2nd (second)
• 3rd (third)
• 4th (fourth)

Important Notes:

• Ordinal form of number 2
• Indicates position, not quantity
• Pronounced "second"
• Different from the cardinal number "two"