Heegaard splittings are fundamental tools in 3-dimensional topology.

The Heegaard decomposition of a 3-manifold is a way to express it as a union of two handlebodies.

The Heegaard splitting of the manifold provides a decomposition into two handlebodies.

Heedfulness is important for success.

North Carolina is often referred to as the Tar Heel State.

He used to be wealthy, but now he's down at the heel.

He used to be wealthy, but now he's down in the heel.

He used to be wealthy, but now he is down at heel.

He called his boss a shit heel.

He is such a shit-heel.