未知数
wèi​zhī​shù HSK7

unknown number

未知数 (未知數) wèi​zhī​shù
unknown number noun
a variable or quantity whose value is not yet determined in a mathematical equation
uncertainty noun
a factor, situation, or outcome that is not yet known or decided

Frequency
Movie subtitles
0.510 per million appears in 0% of films
Written text
2.68 per million

Details
HSK 3.0
Level 7

Cross-References

Has erhua variant

Sources
Definitions
CC-CEDICT
Frequency data
SUBTLEX-CHBCC Corpus (BLCU)