Sentence examples for strings of letters from inspiring English sources

Remember the distorted, obfuscated strings of letters called CAPTCHAS that you have to identify to get into some Web sites?

Apple's unique device identifiers — known as U.D.I.D.'s — are 40-character strings of letters and numbers assigned to Apple devices.

Apple's unique device identifiers are 40-character strings of letters and numbers assigned to Apple devices that act as fingerprints for the company's mobile devices.

But when you dictate into a program like Skype, all you get is creepy random strings of letters, completely useless unless you work in a license-plate factory.

"We build on the ability to remember faces better than a string of letters and numbers".

The customers then receive a text message that includes a string of letters and numbers.

Taken as a string of letters to be memorized and regurgitated, it's unremarkable.