Both Angels and Demons have a tell - so, what IS a tell?

A tell is something that sets Angels and Demons apart from normal humans. It's often something that has come up in supernatural lore of legend at some time or another, though not necessarily anything attached to angels or demons specifically. For instance, there is an old wives tale which suggests having a star shape on the palm is a sign of being a werewolf. Sure, it has nothing to do with werewolves, but that doesn't mean it isn't a tell of some description that an angel or a demon could have (we don't ask for tells for lycanthropes in this game, this was just used as an example of where a tell has featured in existing lore). Other tells include but are not limited to:

-extra nipples down the torso
-unnaturally colored eyes
-cat/snake eyes
-horns
-clawed toenails
-pinky as long as the ring finger on both hands
-extra fingers
-forked tongue
-tail
-fangs
-unnatural scents(that don't come from perfume and never go away, like sulfer, or honey or something)
-seeming to attract more light than anyone else in the room(they look just a little bit brighter)
-seeming to always be in shadow
-shadows pointing the wrong way
-hair/clothes blowing in the wrong direction of the wind
-plants wither or perk up in their presence(choose one)