丁
チョウ, テイ, チン, トウ, チ, ひのと

street, ward, town, counter for guns, tools, leaves or cakes of something, even number, 4th calendar sign

JLPT1 G3 S2 F1312

The relevant oracle bone form of this character shows the head of a nail driven straight into an object → raise a hammer and strike straight down on a nail. A seal inscription form depicts a nail at a right angle to a surface → T shape → *counter* (for city blocks, or blocks of tofu; or for the two sides of a page of text) (← shape of character) → *unit of length* (about 109 meters). *Fourth in a series* and *fourth calendar sign* are borrowed meanings.

[Full Kanji Etymology List]