The seed of his success lies in his effort.

If you plant this seed, beautiful flowers will bloom.

This equation has a singularity.

A proper noun is a noun that refers to a specific person, place, or thing.

This eigenfunction is one of the fundamental concepts of quantum mechanics.

She is receiving acupuncture treatment using gold needles.

The firing pin of this gun is broken.

I will use this probing pin to find out the problem in the electronic circuit.

She bought a knitting needle for her new project.

The Australian continent is the smallest continent on Earth.