Usage Note
Erre is the name given to the letter r in the Spanish alphabet, and it is especially associated with the strongly trilled /rr/ sound. The phrase erre que erre ('stubborn as a mule', literally 'r after r') is a common fixed expression meaning dogged persistence or pigheadedness. The letter name is feminine (la erre), following the general rule that all letter names in Spanish are feminine.
Examples
"La erre doble es difícil de pronunciar."
Natural Translation
The double R is hard to pronounce.

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