Shapes in letter counters

Hi all,

Rather new to this business, so please go gently. I have come here to ask a question about a distinguishing feature of a select few typefaces I've come across while searching for information on this obscure feature. I first came across it as subtitles on a Youtube video published about four months ago using an as yet unidentified typeface below.

Bottom line is this: is there a name for, or set of rules around the use of, dots or diamonds inside the apertures of Qs and Os? There are other examples below that have this feature, found on myfonts, going by the name of Hustlers and Lakester, and a few others, but not many.

The only reference that I have found that appears to come close to this is a particular variant of a Cyrillic O, referred to as a "monocular O". After some to-ing and fro-ing over Google (other search engines are available), I've resorted to asking those who might actually know directly. So I come to you, because this has been bugging me for months.

Any information would be greatly appreciated.