What does a letter mean at the end of sentence?

It depends on the letter! Here's a breakdown of the common uses of letters at the end of sentences:

Punctuation:

* Period (.) The most common ending, signaling a complete thought.

* Question Mark (?) Used at the end of a question.

* Exclamation Point (!) Indicates strong emotion, surprise, or emphasis.

Abbreviations:

* Jr. (Junior), Sr. (Senior), Ph.D. (Doctor of Philosophy), etc. These are abbreviations following a name to indicate titles or degrees.

Formal Letters:

* Yours truly, Sincerely, Respectfully, etc. These are closing phrases used at the end of formal letters.

Other:

* Letters can also be used as part of a word: "The cat sat on the mat."

Example:

Let's look at the sentence: "What a beautiful day it is! It's perfect for a walk in the park. Sincerely, Sarah."

* The first sentence ends with an exclamation point because it expresses strong emotion.

* The second sentence ends with a period, as it is a statement.

* The third sentence ends with "Sincerely, Sarah" which is a formal closing phrase.

Important Note: If you're unsure what a letter at the end of a sentence means, context is key! Consider the surrounding words and the overall purpose of the writing.