Why is Futaba's nickname "Teko"? In Episode 1 of Amanchu!, Hikari bestows the nickname &quot;Teko&quot; on Futaba, with the following explanation.







Hikari: [Gazes longingly into Futaba's eyes]
Hikari: Wow! Your eyebrows are so thin. They're, like, one-tenth as thick as the average. One-tenth...Tenth...Teko! An adorable nickname!

How did Hikari hit upon this nickname in the original Japanese? And bonus question: the translation I read of the manga translated Futaba's nickname as &quot;Dotty&quot;. Was this completely out of nowhere, or does it have some justification in the original?
In Japanese, Hikari says that Futaba's eyebrows look like tenten, the two strokes added to a kana to change the voicing value, also known as dakuten. E.g. か ka becomes が ga.

You can see the resemblance in this picture from the manga, at least if you imagine Futaba's eyebrows both pointing in the same direction:





"Dotty" came from a translation of tenten as "dot", presumably because "Periody" or "Semicolony" didn't sound good.