Bullets are more formal and have been around longer than smilies

Html buffs will know that an ordered list will produce a certain pattern of bullets and tab keys often change the bullet in word processing programs.
Recently, I've redone my own CV and helped to prepare several students' CV's. When listing achievements, I have found that Chevrons (arrows without the shaft) look good for main points in CV's with ticks for secondary points and I've advised students to stick with this format. Not because it is a convention, but just because it looks good.
Does anyone know of any conventions for the use of bullets?
Anyone teach such conventions?