When Montenzuna’s revenge gets 1 unique, and not just ^some revenge, possibly one of many, you are not grammatically allowed to name it and call it Montezuna’s Revenge. There’s none in the books at this particular time.

Can
EDIT: This is reason enough to justify the personal use, for the name to be generally known and accepted this symbol must be shared between a group of people.

^I are not unique, but because it’s unique. I know it’s unique! Isn’t it cute?

Do we need to capitalize all names? For a disease, when there’s no capital in a name as it’s known as, eg tuberculosis is called as, so called the Koch’s disease, don’t capitalize it, unless its formal name is a given name. What should be capitalized first, and not the word disease.

Proper nouns should name specific people, places or things – “specific” being the key word here. In some cases specificity is immediately apparent, e.g. a hypothesis or an example of this type of specificity (think: how are some specific products represented, for example)? “Singapore Airlines”(after all, there is only one airline with that name!).

In some cases, there is a gray area and I would say that fame plays a role in determining specificity. To use your example, one would refer to the Guantanamo letters if they don’t contain any content that is particularly newsworthy. If, on the other hand, these letters happen to disclose some salient information that produced a political scandal, then these letters would rapidly garner attention and become intimately connected to this political scandal in the minds of people. In such a link, the letters will be infused with a specific quality that would warrant the use of a proper noun, i.e., the form “Spy” or “Sword”. Guantanamo Letters.

What will happen if some of the common nouns become real with time? Is it “ok” to call a verb a proper noun?