Change the look of site element on sharepoint

Question

I want to change the look of "more options" button, which looks ass thre bricks "..." as the picture below
link to the picture, More cleare
http://s29.postimg.org/f29je10h3/Namnl_sq.png
I have tried to find it in CSS and masterpage files but couldnt find it.
Where can i find it and change it to a word or an icon.
this is the url for the page http:///sites/SiteCollectionOne/Shared%20Documents/Forms/AllItems.asp

Answer 1

Hi Alba,
In SharePoint 2013, most part of the icon images are displayed from one image which is called spcommon.png and they are in different part of the image.
If you want to change the icon image, you can edit the site’s mater page and use code to change the icon image.
<script src="http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$(".ms-ellipsis-icon").attr('src', 'http://sp/SiteAssets/2.PNG');//change the image URL to your own image which needs to be uploaded to SharePoint
</script>
<style>
.ms-ellipsis-icon{
!important;
.ms-ellipsis-icon-title{
!important;
</style>
Best regards.
Thanks
Victoria Xia
TechNet Community Support
do you know where in the code/ in the page i can find the import of the SPcommon.png file for these 3 bricks. 
I masterpage i could find where to change icon for some features (fullscreen, the blue panner, Dropdown bread clum and so on) but i couldnt find the three ponits,  if i can find the tag for this one then i can change the icon path to another one instead
of spcommon