[odedta]

Well, this works:

.List-Style3 {
  list-style-type: none;
}
.List-Paragraph3 {
  font-family: "Arial", sans-serif;
  font-size: 0.8em;
  text-align: justify;
  display:list-item;
}
.List-Paragraph3:before {
  margin-right:-1.3em;
  content: "★ ";
}

for html:

<ul class="List-Style3">
      <li class="List-Paragraph3">אני ואני בלבד אחראי ליצור אושר בחיי.</li>
</u>

Turns out you were right, the font mattered, if I used "Arial" instead of some other font I embedded it will work, the problem is now that I don't want the list items to show in Arial so I need to use a span tag for this symbol, oh well, this seems fixed.

On a side note, don't use the CSS rule:

direction:rtl

Instead use:

dir="rtl"

In your html files in order to get the desired effect since direction:rtl will not pass validation for EPUB3.
Of course this is a bit silly since both will work, but myself, like some others like to get their files validated.

Thanks again.