As with names ending in S, Z, CH, and SH, the plural adds an ES.
E.g. the Fox family are the Foxes.
X-rays is the plural of x-ray
Letters is the plural of letter
The singular possessive form of letter is letter's. The plural of letter is letters. The plural possessive of letters is letters'
D's.To create the plural of any single letter, place an apostrophe between the letter and s.
boxesfixespoxesmixesfaxesduxeswaxessixeshexes
The plural of the letter X is Xs or X's (the apostrophe is still allowable under some style guides, and you can use X's if there is a chance of confusion with other symbols).
The plural of the letter "a" is "as."
X-rays is the plural of x-ray
The plural noun is x rays.
Letters is the plural of letter
The plural of letter is letters.
The singular possessive form of letter is letter's. The plural of letter is letters. The plural possessive of letters is letters'
ar is not a letter. R is a letter. The plural would be Rs.
The plural possessive of "letter C" is "letters C's."
D's.To create the plural of any single letter, place an apostrophe between the letter and s.
The plural form of mouse is mice, so the last letter is an e.
To form the plural of a noun ending in an 's', 'z', 'sh', 'ch', or any other sibilant ('s') sound, you add '-es'. The pronunciation of the letter 'x' ends in an 's' sound, therefore you add '-es' to the word. For example: Box, boxes.