The phrase "a cluster of letters" is correct and usable in written English.
It can be used to describe a group of letters that are grouped together, often in the context of language, coding, or cryptography.
Example: "The password was simply a cluster of letters that made it easy to remember but hard to guess."
Alternatives: "a group of letters" or "a collection of letters".
From there, he collects a "cluster" of letters (usually four to six) that form the lead section — "After Health Bill Defeat, What's Next?" in today's paper.
There's a cluster of letters that make no sense to the Western ear as you move down to the end of the Russian alphabet, and this one's the first.
In other words, the details fade into the background and the word is a cluster of letters with one or two clear details. (You can see what is in the child's mind by asking him or her to write the word. Often you will get combinations such as elfut or lfnt).
In the distracter version a cluster of letters surrounded the central RSVP (Fig. 5).
First we're gripped by the simplicity of his language, then his frequent inability to spell it, and now we dedicate hours to finding a use for a nonsense cluster of letters.
A cluster of numbers and letters first vanished from the screen for 24 seconds, and then six minutes later, the same data disappeared for an additional 36 seconds.
At posterior sites, over the left occipito/temporal area, the N3 response (345 395 ms) showed a gradient of activation with the highest response for the more familiar words and the lowest response for the less familiar word-like cluster of letters.
Dr Meibom's paper (to be published soon in Astrophysical Journal Letters) looked at a cluster of stars that is roughly a billion years old, and found that the relationship between age and spin-speed was still tight.In itself, that is but a small advance.
The attorney general's office sent cease-and-desist letters to Walmart, Sears, Kmart, Amazon and a cluster of smaller toy websites in December.
A1 TRACKING A LETTER -- The envelope that created a cluster of inhalation anthrax cases in Washington.
A cluster of pathologies?
