Splash image graphics

When using the Standard splash theme, the respective icons jump in the left corner of the screen. Would somebody help me learn the name of each of those icons and where they are located in the sources? The last jumping icon is a plain text document icon. I doubt that is the intended icon. That icon often is used when another icon is not found or not specified. I want to change the icon to the default Trinity logo icon, like the other splash themes. Thanks! Darrell