How to write single letters?

tammons said:

Is this a good way to handle it?

"Her name was Seraa with an extra A."

How about letters in plural form.

"What a clamor of S's."

These are not from my novel. Just questions.

Click to expand...

The first example is fine and gets the point across. I go one step further and put the indicated letter letter in italics just to set it apart. "Her name was Seraa with an extra A."

Your second example is incorrect and confusing. An apostrophe doesn't make the letter S plural, it makes it possessive.

Many Ss, just like when you talk about music from the 70s.

An apostrophe is also used to form some plurals, especially the plural of letters and digits. Raoul got four A's last term and his sister got four 6's in the ice-skating competition. This is particularly useful when the letter being pluralized is in the lower case: "minding one's p's and q's" or "Don't forget to dot your i's." (In a context in which the plural is clear, apostrophes after upper-case letters are not necessary: "He got four As, two Bs, and three Cs.") It is no longer considered necessary or even correct to create the plural of years or decades or abbreviations with an apostrophe:

• 
  [*=left]He wrote several novels during the 1930s.
  [*=left]There are fifteen PhDs on our faculty.
  [*=left]My sister and I have identical IQs.

(If you wrote Ph.D. with periods, you would add an apostrophe before the pluralizing "s": Ph.D.'s) If the abbreviation or acronym ends in "S," it's a good idea to separate this final "S" from the pluralizing "s" with an apostrophe: SOS's

http://grammar.ccc.commnet.edu/grammar/marks/apostrophe.htm

I think you can introduce Seraa's name in dialogue to explain the different spelling, ie, "My name is Seraa." "How do you spell that?"

If you're writing a fantasy-type novel, oddly spelled names are expected and shouldn't need explanation.