I cannot find a list of standard plot markers (square, trinagle, dot, circle, disk, cross, plus,  ...) and how to use them.

Fore example I can access a self made cross, by:

    cross = Graphics[{Blue, Line[{{{-1, -1}, {1, 1}}, {{-1, 1}, {1, -1}}}]}];
    
    ListPlot[{{1, 1}, {2, 2}}, PlotMarkers -> {cross, 0.1}, PlotRange -> {{0, 2.5}, {0, 2.5}}, 
     AspectRatio -> Automatic]


[![enter image description here][1]][1]

Is this symbol and the others in the list predefined, and how can I use them in a plot?

UPDATE:

Following Carl Wolls proposal I tried:

    p = Style[Graphics`PlotMarkers[][[6, 1]], FontFamily -> "Times"];
    
    circle = Graphics[Circle[{0, 0}, 1]];
    
    range = Range[0.9, 1.15, 0.1];
    
    ListPlot[{{{1, 1}, {2, 2}}, {{1, 1}, {2, 2}}, {{1, 1}, {2, 2}}}, 
     PlotMarkers -> {{p, 300}, {cross, 0.05}, {circle, 0.3}}, GridLines -> {range, range}, 
     PlotRange -> {{0.8, 1.15}, {0.8, 1.15}}, AspectRatio -> Automatic]

[![enter image description here][2]][2]

As you see the symbol `p` is still not centered around the data point `{1,1}`, whereas `circle` and `cross` are correct. 


  [1]: https://i.sstatic.net/QgWH6.jpg
  [2]: https://i.sstatic.net/2lxHr.jpg