# Pairs and pairs

I'm absolutely full of pairs,
And that's why I'm important.
If my owner's used to describe me,
I'd be like just a pair of letters.

With the first pair, I'm from a plant or animal.
With the second pair, you won't see me at all.
With the third pair, you'll hear me instead.
With the fourth pair, I'm out in the open.

What am I?

Hint:

I'm glad that someone (Tom) fell for the red herring of assuming the answer must be an eight-letter word with each of the last four lines referring respectively to its pairs of letters. But that's not the right solution method.

• Mayday! Well done Sir. – Tom May 1 '20 at 8:26
• @Tom Thank you! SE doesn't send out T-shirts and mugs to 100k-rep users any more, but I'll take it :-D – Rand al'Thor May 1 '20 at 8:28
• I've been trying off and on to find an answer related to rot13(puebzbfbzrf, trarf be QAN) but everything I've come up with has too many pairs, or not enough. – Reve May 5 '20 at 20:31
• @Reve That's way off, although in an unexpected way closer than one might imagine. – Rand al'Thor May 5 '20 at 20:40

I'm absolutely full of pairs, And that's why I'm important.

Latin (English) letters, twenty-six pairs which are upper and lower case.

If my owner's used to describe me, I'd be like just a pair of letters.

The word alphabet comes from alpha and beta, the first two letters of the Greek alphabet.

With the first pair, I'm from a plant or animal.

AA, a battery or cells, which are the basic units of plants and animals.

With the second pair, you won't see me at all.

BB, Big Brother is watching you, but no one seems to have ever seen him.

With the third pair, you'll hear me instead.

cc, motor engines are given in cc as cubic centimetres, and these are noisy.

With the fourth pair, I'm out in the open.

DD, due diligence reveals the hidden, and puts matters out in the open.

First fo(o)lio attempt:

Shall I compare thee to a summer's day? Thou art more lovely and more

Sonnetry

I'm absolutely full of pairs, And that's why I'm important.

Fourteen lines with rhyme scheme abab cdcd efef gg

If my owner's used to describe me, I'd be like just a pair of letters.

T.T. - Thomas Thorpe, the publisher of Shakespeare's sonnets

With the first pair, I'm from a plant or animal.

so - a type of usually dairy - but maybe from soy milk - product from Japan

With the second pair, you won't see me at all.

nn - $$N_2$$ as nitrogen gas is invisible

With the third pair, you'll hear me instead.

E.T. - this song was Katy Perry's fifth number one in the U.S. Billboard

With the fourth pair, I'm out in the open.

Ry - a railway, or a Danish town :)

• Wow! You've made this fit surprisingly well - I'm impressed - but it's not the intended solution. Note the lack of knowledge/trivia tags, which I would have included for some of these clues if they were part of it. Not sure if I should edit the riddle now, or wait to see if someone gets the completely different intended answer ... – Rand al'Thor May 1 '20 at 10:29
• No need to edit. Just a fun try :p – Tom May 1 '20 at 10:30
• Also so wrong as not soy. – Tom May 1 '20 at 12:32
• Sorry, still not there. Another nice attempt, but I think this fits a bit less well than the first one: batteries don't come from plants/animals, and Big Brother can be seen on many posters. – Rand al'Thor May 6 '20 at 21:14
• Ao, ijoo! Thought this was it. – Tom May 6 '20 at 21:17