gvim What do the @ symbols mean at the bottom left of the screen?

Question

I've been getting used to using vim for the last two weeks and am really starting to like it. There's one thing I've been wondering about - sometimes when I'm typing something, these rows with nothing but the @ symbol appear at the bottom of the screen:

This has happened a couple of times but I've never paid much attention to it, but I'm curious - like in that situation, pressing enter gets rid of one of them, and pressing enter again gets rid of the other. Then another two enters after that, another @ row appears. Does anyone know what they mean?

Answer 1

this usually happens when you open a very big file (or very long lines).

You can set display option to show all lines. (without showing those @).

lastline    When included, as much as possible of the last line
        in a window will be displayed.  When not included, a
        last line that doesn't fit is replaced with "@" lines.

e.g. in my vimrc, I have set display=lastline

if you want to know detail about it, check :h 'display'