The x-rated personalized license plate

My grandmother had just bought a new car. She wanted a personalized license plate so she could easily remember it. She received the plates and put them on her car. They appeared strange to her though. She asked my mother to come outside and look. Mom started laughing right after reading the plate. She then read it aloud for my grandmother. My grandmother had used her first name: HELEN, the initial of her last name: F, and the first letter of the State she lived in: Utah. So her personalized license plate read: HELENFU.
She kept the plates on the car for a year. She had to explain every time anyone asked.