Couplet = couple = 2 lines
Quatrain = quadruple = 4 lines
Sestet = 6 lines
Octave = octagon = 8 lines
Thats how I try to remember it.
That way you know what kind of audience your writing for you can use different words with a lot more complexity. its completely different writing for kindergarteners and writing a paper for a college seminar.
Hope this answered your question.
I feel proud when I tell people that I'm from Swat in Pakistan, with its green and mountainous valley. But I don't feel proud about the number of women and girls where I'm from who are still being deprived of an education.
Among the girls whom I have taught – girls including Malala Yousafzai, the young education activist whom the Taliban tried to assassinate – I see the dignity that education can offer. This is why I have dedicated my career to teaching, and why I am doing what I can to ensure all girls have the chance to go to school.