He received two second yellow cards in the match.

The distance between the Earth and the Moon is about 1.3 milli-light seconds.

My second cousin once removed is coming to visit me.

The petty officer second class is responsible for maintaining the ship's equipment.

The petty officers second class are responsible for training new recruits.

Monadic second-order logic is a branch of mathematical logic.

My sister and I are second cousins once removed.

Monadic second-order logics are used in formal logic and computer science.

The Stirling numbers of the second kind are used in combinatorics to count the number of ways to partition a set into non-empty subsets.

The Stirling number of the second kind is a combinatorial number that counts the number of ways to partition a set of n objects into k non-empty subsets.