Most of the symbols are selfexplaning. Many symbols contain daedric letters and some of them are really weird.
All effect symbols related to fatigue got an Ekem (Daedric E) in it, which seems logical if translated with endurance. e.g. [img]http://www.uesp.net/w/images/MS_FortifyFatigue.jpg[/img]. All effects with attributes contain an Ayem (A), so this is also logical.
But there are other examples.
All effects related to health got a Q (Quam) in its symbol. [img]http://www.uesp.net/w/images/MS_FortifyHealth.jpg[/img]
All effects related to magicka got U (Yoodt). [img]http://www.uesp.net/w/images/MS_FortifyMagicka.jpg[/img]
Everthing in touch with skills got a N (Neht). [img]http://www.uesp.net/w/images/MS_FortifySkill.jpg[/img]
Then there are other unique symbols. Like Summon Winged Twilight which seems to be made from an unkown letter and a Cess © and a (Quam) Q.
Does anybody know the meaning of these piktograms or are the letters just random?