INDEFINITE ARTICLE WITH INITIALISMS

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Note: An initialism is a group of initial letters, each pronounced separately, used as an abbreviation of a name.

Many English speakers who probably use the indefinite article an in front of a vowel when speaking seem to encounter a mental disconnect when it comes to writing.

The following examples were found on major news sites or on sites offering professional services or advice:

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The problem lies in an incomplete understanding of the rule for the use of a and an.

Many speakers retain the rule as “Use an before words that begin with a vowel and a before words that begin with a consonant.”

The complete rule is “Use an before words that begin with a vowel sound and a before words that begin with a consonant sound.”

The 26 letters of the alphabet are sound symbols, but the symbols have names. And several of the consonant letters have names that begin with vowel sounds:

F [ef]
H [aitch]
L [el]
M [em]
N [en]
S [es]
R [ar]

Here’s the correct way to write the words and initialisms given in boldface above:

Pieces of the bag recovered have been sent to an FBI lab for forensic testing.

The 404 or Not Found error message is an HTTP standard response code.

Step-by-step tutorial on how to add an LED to a USB thumb drive.

Applying to an MBA program can help you advance in your career or switch careers entirely.

An NBC executive indicated that the independent formatted Nonstop channels were doing well but needed separate 24/7 programming.

There are several benefits to being an RSVP Volunteer.

Did you setup and assign an STMP server for this account?

In deciding whether to write a or an in front of an initialism, say the name of the first letter. If the letter name begins with a vowel sound, use an.