What Does It Stand For?

I give you the abbreviation, you tell me what it stands for.
Thanks to @Jarl5, we now have two answers for cu.
More special thanks for @Jerry928, for helping me with merging cells, and suggesting many more type-ins!
If you believe an answer should be added, let me know in the comments!
Quiz by geographyisthebestsubject
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Last updated: November 22, 2017
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First submittedMay 29, 2016
Times taken66
Average score20.0%
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Abbreviation
What It Stands For
GMT
Greenwich Mean Time
NATO
North Atlantic Treaty Organization
wt.
Weight
pl.
Plural
Poland
Lib.
Library
Liberal
Libertarian
IRS
Internal Revenue Service
et al.
Et alii (and others)
cu
Cubic
Copper
Cuba
cu
Academy
at. no.
Atomic Number
co.
County
Company
FM
Frequency Modulation
GDP
Gross Domestic Product
i.e.
Id est (that is)
+2
Level 68
Jun 11, 2017
Cool idea! One suggestion I have is to offer Copper as an option for cu. Also, I'm not quite sure how to do it myself, but maybe you should make it so it accepts each word separately? I see it on some quizzes.
+1
Level 61
Jun 12, 2017
Thanks! I was proud of this quiz. More of these to come, for sure. Looks like we are in the same boat! Not quite sure how to edit the quiz so that it will accept cubic and copper separately, but for now, I added copper as a type-in. I will investigate the situation, probably even ask on Jetpunk's subreddit, and report back.
+1
Level 61
Jul 1, 2017
It is now finally fixed! Thanks so much for your suggestion, as it helps better my quizzes! Jerry928 also helped me out on the subreddit (as I'm sure you already saw) with merging the cells.
+2
Level 76
Jul 5, 2017
Thanks for the mention! A couple of other bits of feedback: Also accept "organisation"? You can achieve that using the type-in box and choose "Regex" then type in ^NORTHATLANTICTREATYORGANI[SZ]ATION (the ^ means "starts with", and where 2 or more letters are bracketed, either will work). Thus ^S[IOU]N will accept sin, son or sun, and ^S[IOU]+N will accept sin, son, sun, sion, soon, and even soiuiuioiuiiiiiiioin. But S[IOU]N without the leading ^ accepts anything as long as it contains son, sin or sun, for example Anderson. Also, when I typed in copper, it gave me cubic as well! To make people choose both, one answer at a time, you'll need to have copper as one answer, and cubic as the other. Finally "Lib" can also mean Liberal or Libertarian, and "co" can mean Company.
+1
Level 61
Jul 6, 2017
You're welcome! Thank you so much for the NATO type-in feedback and other words that can be abbreviated as Lib. and co. It may have taken a while for me to figure it out, but I probably never would have without your help. Please let me know if you notice anything else, as you definitely helped better this quiz!
+2
Level 58
Nov 12, 2017
CU also stand for Cuba and PL also stand for Poland ISO 3166-1
+1
Level 61
Nov 21, 2017
Thank you so much, again! Nice sourcing and observational skills.