Means 'Or'. Also suggests 'something like that'.
Usage
•
이나: After a consonant.
•
나: After a vowel.
Nuance
When used with a single noun, it implies "something like..." (e.g., "Let's just have coffee or something"). It can also express surprise at a large quantity ("as many as X").
In Context
밥이나 먹자.
Let's eat rice (or something similar).
커피나 차를 마셔요.
Drink coffee or tea.