from Wikipedia
"In the context of hairstyles, the usage of
the term pigtail (or twin tail or twintail) shows considerable variation. The term may refer to a single
braid, but is more frequently used in the plural ("pigtails") to refer to twin
braids on opposite sides of the head. Sometimes, the term "pigtails" applies regardless of whether the hair is braided,[1] but there is not widespread agreement on this (in places where this usage is common,
unbraided pairs are called doggie ears or bunches and a
single bunch, regardless of position on the head,
is called a ponytail)."