If an unfamiliar abbreviation is used, the first instance of it should be spelled out and explained, if necessary. Then use it as needed.
I agree, if it is explained in the first post in any thread that mentions it. But new people are coming on all the time and there are many variations of English. If one can go back to it's first use in a thread and get the meaning, that would be great. But that is not likely to happen at each thread.
Here is just a few of the about 170 regional variations of the English language:
British English
British English is the regional dialect spoken throughout the United Kingdom. It is characterized by a non-rhotic pronunciation, where the "r" at the end of words is generally not pronounced unless followed by a vowel, leading to more pronounced vowel sounds. This dialect is highly diverse, with numerous regional accents such as Cockney from East London, Geordie from Newcastle, and the Received Pronunciation (RP), often considered the standard accent in formal settings.
The vocabulary of British English includes unique terms and usage, distinguishing it domestically and internationally. For instance, British English uses "lorry" for what is known as a "truck" in American English, and "flat" instead of "apartment."
American English
American English has developed distinct characteristics that set it apart from its parent language, British English, primarily due to the diverse cultural influences of European settlers in America. Over time, these influences have shaped American English in several key ways. Furthermore, Americans tend to use contractions such as "can't," "won't," and "don't" more frequently than their British counterparts. American English commonly uses the simple past tense in contexts where other dialects might use the present perfect. For example, Americans are likely to say "I already saw that movie" instead of "I have already seen that movie." This usage reflects a more informal style that permeates American everyday speech.
Pronunciation also varies significantly between American and British English, with some words having completely different pronunciations. A classic example is the word "tomato," pronounced "tuh-MAH-toh" in British English and "tuh-MAY-toh" in American English.
Australian English
Australian English shares many similarities with British English due to Australia's colonial history but has developed its own idiosyncratic characteristics over time, influenced by the diverse accents of the early settlers from the United Kingdom and Ireland, as well as the languages of Indigenous Australians. It has noticeable vowel shifts that add a nasal sound to words like "mate" and "date." The dialect includes informal slang such as "arvo" for afternoon, "bikkie" for biscuit, and "bottle-o" for the liquor store.
Indian English
Indian English is an interesting variation because it combines aspects of both British English and Asian languages like Urdu or Hindi.It retains much of its original grammar structure but adds various elements that make it distinctively Indian - for example, Indian English often place adjectives before nouns instead of after them as most other dialects do; this is similar to how adjectives are structured in
Hindi or
Urdu sentences. In terms of consonant sounds, the "w" is frequently pronounced similarly to "v," making "wet" sound like "vet."
Canadian English
Canadian English draws heavily from both BrE and AmE but also incorporates elements taken from French due to Canada's history with French colonization before becoming a British colony itself. This dialect follows grammatical structures similar to those used in American English but incorporates direct French phrases into everyday language, such as "bonjour" and "bonsoir" for "hello" and "good evening," respectively. Additionally, Canadian English has developed its own set of slang terms. For example, a "double-double" refers to a coffee with two creams and two sugars, a "parkade" is a type of multi-level parking garage.
Scottish English
Scottish people speak their unique variation of the language that has been heavily influenced by Scots Gaelic due to Scotland's long history as part of Great Britain but with its own distinct culture and identity within these islands too! One noticeable difference between Scottish and other varieties comes down to pronunciation - many Scottish natives tend to roll their Rs more frequently than others do when speaking aloud! Additionally, there are several distinct vocabulary choices used in Scotland that aren't found elsewhere - for instance, calling someone a "weegie" means they're from Glasgow!
Nigerian English
Nigerian English is spoken primarily in Nigeria and is heavily influenced by African languages like Hausa and Igbo. This variety of English typically combines British and American spelling conventions, though British spellings are more commonly used. A distinctive grammatical feature that stems from African languages is the pluralization of all nouns. For example, in Nigerian English, it's common to hear, "She gave me many useful advices," where "advice" is used in the plural form, a practice unusual in other English dialects. Nigerian English also incorporates a lot of slang terms, such as “chop” which means to eat food, or “mehn” which is an expression used to emphasize something.
Philippine English
Philippine English is a variant of the language that has been heavily influenced by Tagalog, the most widely-spoken language in the Philippines. As such, Philippine English tends to be much more relaxed than other variants of the language; for example, it often uses contractions like “ain't” instead of using proper grammar rules like saying "isn't". The use of Tagalog words in Philippine English is also common; words like “karaoke” (from karangalan) or “jeepney” (from jeep) are examples of these kinds of words.
Singaporean English
Singaporean English has been shaped by both British colonial influences and
Chinese influences. It features less formal grammar, frequently using contractions like "gonna" instead of "going to."Brief words like "lah," "ah," and others are often appended to sentences to add extra layers of meaning or express emotions like surprise or confusion. For example, if someone is impressed by a meal, they might comment, "This food is delicious siah!" where "siah" is used to really highlight their approval.
to demur. The price was very attractive, so I still have no qualms about having made the "investment". 
for it here, so it's a shelf 
