The phrase "allocated letter" is correct and usable in written English.
It can be used in contexts where a specific letter has been assigned or designated for a particular purpose or recipient.
Example: "The allocated letter for the project was sent out last week to all team members."
Alternatives: "designated letter" or "assigned letter".
For a straight woman not allocated a letter in the LGBT alphabet soup, the prospect of working for the LGBT rights movement seemed incredibly daunting.
Each treatment arm will be randomly allocated a letter (A, B, C or D) by way of opaque sealed envelope.
The space allocated to letters in the newspaper represents a fraction of those that they receive, and they are carefully selected, edited and sub-edited to fit into a finite bit of space allocated daily in print.
Each major company will be allocated a single letter and they will have to name all of their major products starting with that letter.
Following the change in Code Letters in 1934, Centaur was allocated the Code Letters GMQP.
This week Belgian theatre director Alexander Devriendt says that each major food company should be allocated a single letter to name their products.
Leo Minor does not have a star designated Alpha because Baily erred and allocated a Greek letter to only one star, Beta.
A bioterrorism-preparedness bill passed in the aftermath of the anthrax letters allocated $1.1 billion to the DHHS, with most of that going to the CDC and the rest to the Health Resources and Services Adminstration, which oversees hospitals round the country.
Samples were allocated a two-letter code and a number representing sea of collection and sampling site (i.e. NS1, EC2, IS4) and two numbers indicating the year of collection (05 08).
A letter about the allocated treatment arm informs all caregivers.
The intervention packages were posted with a brief covering letter to those allocated to the intervention arm in March 2004.
