The English letter for car Bluetooth is 'B'.

Car Bluetooth technology has revolutionized the way we listen to music and make phone calls while driving. With just a few clicks, we can easily connect our smartphone or other compatible device to our car's audio system and enjoy hands-free communication and entertainment.

The 'B' in Bluetooth stands for Danish King Harald Bluetooth, who lived in the 10th century and was known for his ability to bring people together. The name was chosen to reflect the technology's ability to connect different devices and enable communication.

Today, Bluetooth technology is used in a wide range of applications, from wireless headphones to smart home devices. But it all started with the simple idea of connecting a phone to a car stereo system. And thanks to the letter 'B,' we can now enjoy a safer and more convenient driving experience.