二値 is read as にち (nichi) and means binary.
にち
nichi
にちろんりがく
two-valued logic
はたち
20 years old
にりゅう
second-rate
にぶ
two parts
にじ
second
にじゅうよじかんせい
around-the-clock system
にき
two periods
にばん
にのつぎ
secondary
にごう
number two
によう
two flat things
ふたりづれ
party of two