French letters is a slang term that refers to a condom. It's a term widely used in the UK and the Commonwealth countries. However, there are multiple synonyms for French letters that are used in different parts of the world. In the United States, a condom may be known as a rubber or jimmy hat. In Australia, it's often called a "franger." The term "love glove" is also sometimes used as an alternative for French letters. Other expressions for condoms include "safer sex sleeve" and "protection packet." Whatever the term, the important thing is to use protection during sexual activity to avoid unwanted pregnancies and sexually transmitted diseases.