The phrase "are letter" is not correct in English.
Did you mean "are letters"? If this is the case, you can use it when discussing the plural form of the word "letter" in various contexts, such as grammar or communication.
Example: "In the English alphabet, there are letters that represent different sounds."
Alternatives: "are characters" or "are symbols".
Two are letter impression books of his correspondence with colleagues, clients, business associates and legislators.
Most courses are letter graded (not pass/D/fail) and may be taken in fulfillment of the distribution requirement in LA (Literature and Arts).
It acquaints us with the thought that the things which stimulate and enflame the senses are not among the things that really are (Letter 58.18 and 26).
The frontier letters are letter articles, which are invited by the Editor in Chief, while the technical reports are for the presentations of software tools, experimental or computational methods, or hardware designs.
Transmedia storytelling and epistolary projects such as Ken Eklund's FutureCoast and Marina Zurkow and Uma Chaudhuri's Dear Climate are web-based, and both projects invite the public to participate in FutureCoast we are storytellers and curators of others' stories, while in the case of Dear [End Page 159] Climate we are letter writers.
They are letter perfect in their roles.
Subjects at MIT are letter-graded (A/B/C/D/F) or pass-fail (Pass/D/F).
Here is the actual Goings On About Town blurb from the April 19 , 1958issue of The New Yorker: EL MOROCCO, 154 E. 54th St., (EL 5-8769) — Of necessity, through the years, the elder mimes in the interesting old morality play on view here have one by one dropped out, but the replacements are letter-perfect, and the play still has a message for each and every one of us.
There are letters which substantiate that.
There are letters from Emily Dickinson, Claude Lévi-Strauss Lévi-Strauss, Lenin
Some essays are letters into the future.
