Addition of a dot to 大 (dà; big) to mean "very" or "extremely".

The traditional characters 陰 (Yin) and 陽 (Yang) were simplified to 阴 and 阳. In Chinese philosophy, the moon (月) corresponds to Yin (阴) and the sun (日) corresponds to Yang (阳).

Original meaning: tattoo the face for a crime committed

Pictograph of a person whose face has been tattooed, now written as 墨. In ancient China criminals were punished by having their faces permanently marked. Later writers reanalyzed the character as a chimney being blackened by fire, so the bottom component was written to look like 炎 (flame).

Pictograph of a small child with its two arms waving.

Original meaning: to carve jade

Depicts a carved jade object, now written as 彫/琱. The meaning later shifted to "circumference" and "cycle". Later the 口 component was added when 周 was used to refer to a geographical region to indicate that the character was only "mouthed", i.e. used for its sound. In simplified Chinese 周 is also used to mean "week", while in traditional Chinese this meaning is written with a separate character 週.

Phonosemantic compound. 阝 represents the meaning and 昜 represents the sound.