円

Etymology 2
.

Glyph origin
Japanese simplification of 圓, via a simplified character similar to 𠮚.

Specifically, starting in the beginning of the Meiji period, the in the middle of the character was abbreviated to 丨 in handwriting. As time went on, the bottom stroke of 囗 gradually rose, until by the time of the adoption of the characters, it had reached or even surpassed the box's centre.

Kanji

 * 1) circle
 * 2) yen

Etymology 1
→

From, with the original sense of "circle, roundness".

The yen sense came much later in the, from , itself from. Compare 🇨🇬 and 🇨🇬. .

The yen became the official currency of Japan in 1871, succeeding the and the.

Noun

 * 1) a round or circular object; a circle; roundness
 * 2)  circle set of all points in plane at a given distance and at a given point
 * 3) yen
 * one yen is equal to 100
 * one yen is equal to 100

Affix

 * 1) circular; round
 * 2) smooth; harmonious
 * 3) yen: the official currency of Japan

Etymology 2
→

From.

Etymology 3
→

Sound shift from maro above.

Prefix

 * : prefix to numbers remaining constant
 * : prefix to noun to mean an object is completely in that noun

Etymology 4
Various nanori readings.

Usage notes
This is the only character whose pronunciation is from modern Japanese, not from Classical Chinese.