The Greek letter is "η" and we call it "ητα". It sounds like "ee" or "eeta". Look at the Tips & notes (at the top left of the exercise page) and there you will find more information about the alphabet.
And if you just move your cursor over the words / letters (see the small gray dots) you will see the answers.
They're likely mobile users. The mobile version of the app, currently 12/08/2017, doesn't offer tips and notes. I signed in online and was surprised to see this. I was 50% done with Spanish and understood if something sounded okay but i had no clue why it sounded like that or could explain it to someone. I started from the beginning again and I'm learning it with rhe gramnar notes. For most of us mobile users, the only place we find out grammar tips and hints are in the comment sections of the questions.
Here you were given two items/letters in Greek to translate into Eng. as shown on the alphabet chart in the Tips&Notes section. That would be as you see above "ee eeta" , You could also have hovered your cursor over the words and seen the answer. Have you seen the Tips&Notes which you can find on every page top left. And now also see the Greek Forums which you might like: here. Let me know how you make out.
it tells me the correct answer is "i, η" which is very odd, using the greek letter in the translation
That is an odd bug we encounter sometimes. Thank you for reporting it we'll continue to try to correct it.
"η" is one of the letters of the Greek alphabet. It sounds like: "ee" as in "see". The letter has a name which is: "ήτα" which sounds like: "eeta". Please look at the Tips&Notes found on each page (top left) and also the use the drop down hints. That is when you pass your cursor over a word the hints will appear below it.
I searched the Greek alphabet online and there is no letter that´s spelled ´eeta´ however, I did see one named ´eta.´ But it´s the letter h (the Greek name pronounced ´ay-tah´) and makes the sound ´ay´ like in the word ´obey.´ My confusion is where Duolingo pronounces it ´ee´ and spells it Eeta. Which one is correct? Or does it go both ways?
Edit: And now that I think about it, when the recorded woman says "ήτα" or "η" I can´t tell whether she´s pronouncing it ¨é¨ or ¨ey¨
Why doesn't Duolingo accept η as Greek "h"? Maybe it does not have the same pronunciation as well as usage, but it IS "h".
Greek does not have Hh which is pronounced as "hu" in "hurry". The Greek Ηη is a vowel and is pronounced as "ee" as in "see, knee, eat". Read the Tips & notes for the ABC skill (click Tips & notes at the top left of the exercise page) for information about the Greek alphabet and how to get the Greek keyboard.
You might like this for help: here
Transcription as "i ita" should be accepted as well, this weird eeta thing drives me crazy
the app seems to be very inconsistent in accepting answers with or without the comma.
I have never seen an answer rejected because of a punctuation error nor for wrong or missing accents. I don't know if the app has a tech problem.
In general, the ABC skill has some problems. If you can get to the next lesson you'll find fewer such issues.
I know "η" sounds like "ee", but the answer can't be "ee ee" but "ee eta".
It was necessary to teach the Greek alphabet so that learners could recognize words and since the names of the letters sound just as the letter in a word sounds it seems logical to introduce the learner to the alphabet as Greek words.
So, "άλφα" is pronounced "ah" in a word and (except for rare exceptions it is always the same). "Βητα" is pronounced "vee" etc.
We have also prepared a link with more details. https://www.duolingo.com/comment/22040507
That is also possible. There is no official way to transliterate the letters and we try to emphasize the sound but i is also possible.
The skill (lesson) you are at is teaching the Greek alphabet. ήτα (Ηη) is one of the letters. See here for a full list of the letters. https://www.duolingo.com/comment/22424028 Don't try to learn them all at once just keep the link for reference.
If you have any other questions just ask.