Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

[Q]: Possible Duplicate: What is the correct way to pluralize an acronym? What's the plural form of 'SMS' (if X), like: I'm concerned, I sent him over a million X but got no response. I usually use text message to get rid of that situation.
[A]: The common way to pluralize acronyms is to add a lowercase S, so it would be SMSs. But SMS (short message service) is not usually used like that. SMS is the service you use to send text messages. SMS can also be used to talk about a feature-set ('It's got unlimited SMS.'), or a technology ('This tablet supports SMS.'). Both text (sometimes abbreviated txt) and text message are used. I'm concerned. I sent him over a million texts, but got no response. or I'm concerned. I sent him over a million text messages, but got no response. Google Ngram seems to support this:


[Q]: For example, let's say I'm copying instructions by hand. The original instructions say: Multiply the first by the second Integrate the third with the fourth Integrate the third with the fifth And on a page I write: Multiply the first by the second Integrate the third with the fourth '' with the fifth I know this example is silly, but hopefully it's clear what I mean. What is this called?.
[A]: They are ditto marks. ditto stems from the Tuscan dialect of the Italian detto - 'said'; Latin dictus - 'said'. Oxford Dictionaries Online.


[Q]: What is the proper way to write this term when writing product documentation? Hyphenated or not? drop down list or drop-down list?.
[A]:
If it's just the compound adjective, use drop-down list. Note, however, that there are classes of components in various frameworks that are called DropDown or DropDownList or various alternatives of the same thing. In such cases use the framework name as is.