In a sense, his nonchalance: is the epitomy of cool or; could be unemotional or; simply misunderstands the gravity of the problem.
Using a colon in the salutation and a comma in closing.
Capitalization and punctuation are optional when using single words or phrases in bulleted form. If each bullet or numbered point is a complete sentence, capitalize the first word and end each sentence with proper ending punctuation. The rule of thumb is to be consistent. Use a colon instead of a semicolon between two sentences when the second sentence explains or illustrates the first sentence and no coordinating conjunction is being used to connect the sentences. If only one sentence follows the colon, do not capitalize the first word of the new sentence. If two or more sentences follow the colon, capitalize the first word of each sentence following.
Whenever a sentence requires commas that would make the series commas seem redundant or confusing the correct punctuation is the semi-colon, e.g., Portland, Birmingham, and Washington can be written using the series comma but if the Portland needed to be specified as to the state and the Birmingham is in England and the Washington was not the District of Columbia, then it would look like this: Portland, Oregon; Birmingham, England; and Washington North Carolina.
The types of punctuation used for setting apart nonessential appositive phrases are commas. When set apart using commas, these phrases can be easily removed without changing the meanings of sentences.
Spaces are not 'marks,' but they are nevertheless the most common form of punctuation. The Romans did not put spaces between words, and divided words at the end of a line without using any punctuation mark. A nightmare!
You use one space after a colon or semi-colon.
The contemptuous nonchalance of her trailed hand irritated him.
Using a colon in the salutation and a comma in closing.
A colon should be used after the salutation in a letter using the standard-block style.
Capitalization and punctuation are optional when using single words or phrases in bulleted form. If each bullet or numbered point is a complete sentence, capitalize the first word and end each sentence with proper ending punctuation. The rule of thumb is to be consistent. Use a colon instead of a semicolon between two sentences when the second sentence explains or illustrates the first sentence and no coordinating conjunction is being used to connect the sentences. If only one sentence follows the colon, do not capitalize the first word of the new sentence. If two or more sentences follow the colon, capitalize the first word of each sentence following.
She had one goal for the summer: to improve her tennis skills.
The comma goes before "therefore" when it is used to connect two independent clauses. The semicolon goes before "therefore" when it is used to separate two closely related independent clauses.
No, colons should not be underlined. When using a colon, it should be formatted as regular text within a sentence.
Semicolons are typically used before conjunctive adverbs like "hence" in a sentence to join two independent clauses. For example: "She studied hard; hence, she aced the exam."
I found a splendid example of why correct punctuation is important.
i tried to commandeer the ship; it did not work out well
If you're referring to attachments in an email, etc., or where ever you may be using a list, a colon could be used, however, there is no rule about a certain punctuation mark that must be used after every time the word is used.