I've not gotten a single letter from you in over two years.

Here in Florida, we use three letters, two numbers, and then a single letter.

The new signs have a station name followed by a single letter and a number.

I'm not sure if you've ever worked on a campaign or in a Congressman's office but every single letter gets attention.

I made you evil, all on the basis of a single letter.

"Do they only have a single letter for the entire word?"

A single letter from her could upset him for several days.

There was a single letter for him in his box at the store.

Just as in computer programs, a single letter can make all the difference.

In fact, each had a single letter of the alphabet.