What Does \bar{\in} Symbol Mean?

[bp_psy]

What does this symbol mean $$\bar{\in}$$? I know what $$\in$$ is but I never saw it with a line on top.

edit. I figured it out I think It was used because they can't print $$\notin$$

 

[Petr Mugver]

Try typing the context or the formula you found that... the stand-alone symbol could mean anything!

 

[g_edgar]

I think you will find this in older manuscripts, before $\notin$ became common.