During practice, the teacher told the class to roll one's r's to achieve a native-like Spanish accent.

In the memo, w/r/t the budget, we requested additional clarification.

As a small r republican, she supports limited government but often criticizes party orthodoxy.

As a small "r" republican, she supports democratic institutions rather than partisan labels.

When plotting the stars' temperatures and luminosities, we used the H-R diagram to identify different stellar populations.

The librarians filed the rare pamphlet under R. I. S. in the database.

In the published study, the peptide was referred to as T. R. H., which complicated literature searches.

We analyzed several star clusters using H-R diagrams to estimate their ages.

When reading historical documents, she noticed the acronym R. O. C. used interchangeably with other names for the island's government.

D. R. Congo sent a team of doctors to assist with the outbreak in the neighboring country.