This full stop indicates the end of the sentence.

He finds it difficult to learn Japanese idioms.

It is important to maintain peace of mind by reading one scripture every day.

He is good at composing music phrases.

What does this phrase mean?

His catchphrase always resonates in my heart.

A noun phrase forms a major part of a sentence.

Each word and each phrase he said was deeply engraved in my heart.

He interpreted his own haiku using the technique of writing and exegesis of one's own haiku.