兆
チョウ, きざ.す, きざ.し

portent, 10**12, trillion, sign, omen, symptoms

JLPT2 G4 S6 F1174

A depiction of animal bones and tortoise shells baked in divination rites, showing the curving cracks/splits that were scrutinized in *fortunetelling* → *sign*; *indication*; *omen* → *symptom*. *Trillion* is a borrowed meaning.

[Full Kanji Etymology List]