Edit in JSFiddle

<p class="um">Lorem ipsum dolor</p>
<br>
<p class="dois">Lorem ipsum dolor</p>
<br>
<p class="tres">Caracteres gerados:</p>

p.um:after {
    content: "FIM";
    display: block;
    color: red;    
}

p { display: inline-block; background: aliceblue;}

p.dois:after {
    content: "  \00BB";
    color: red;    
}

p.tres:after {
    content: "  \0022   \0027   \2039   \203A   \00AB   \00BB   \2018   \2019   \201C   \201D   \201E";
    color: blue;    
}