Yes. Certainly. It sounds like the strip-periods is set to true on the label variable="page". By default it should be shown as p. or pp.

(Hard to tell without seeing your code though. If you want to share it, upload it to Hastebin and share a link with us here.)

which citation style are you using ?
(I think damnation assumed this was a customized citation style)

The default APA style in Zotero does have a full stop after the p. What exactly are you entering into the page field? And are you talking about an in-text citation page number or the pages for a book chapter in the bibliography?

Okay, just to be sure, the full stop is there if you set English as your language?

so you're saying that
σ. and σσ. would be correct, right? We can fix this, but the fill will wait to the next Zotero version. You can fix it by adding

<locale xml:lang="el">
<terms>
<term name="page" form="short">
<single>σ.</single>
<multiple>σσ.</multiple>
</term>
</terms>
</locale>
towards the top of the style right after the last </locale> tag.

General instructions here: https://www.zotero.org/support/dev/citation_styles/style_editing_step-by-step

If this doesn't work for you, the fix is also now in the next version of Zotero, which will be 5.0.57 (can't tell you when that will be released, though)

Thank both of you. Since I'm still learning how to use Zotero, I'll stick to 5.0.56 till the release version is out.