Ahoge
A single strand of hair that sticks out of a character’s head. It literally means “stupid hair” and indicates that the character is usually stupid in some way. However, there are exceptions to this, so it is not a rule. It’s different from antenna hair, which is when there are two or more locks of hair sticking up as opposed to one. Some characters that have an ahoge are:
1) Himeko Katagiri from Pani Poni,
2) Konata Izumi from Lucky Star,
3) Edward Elric from Fullmetal Alchemist,
4) Megumi Momono from Mahoraba,
5) Kenji Harima from School Rumble.