What does this sign mean?

Natural language processing is a technology that allows computers to understand and analyze human language.

It's already late, so good night.

His painting is drawn using the golden ratio.

We need to combine our forces to make this project successful.

That plan is based on rational thinking.

Please research the interaction between these two drugs.

An old person was playing with his grandchild in the park.

Our school's motto is 'Knowledge is power.'

In Japanese, honorific language is an important way to show respect to others.