二強 is read as にきょう (nikyou) and means top two.
にきょう
nikyou
にかべんきょう
studying two lessons
にだいきょうこく
(the) two great powers
ふたえ
diplo-
にげん
repeating oneself
にど
two degrees
にし
two out
にせい
son
にぶん
the two equinoxes (vernal and autumnal)
にいん
the two houses of legislature
にほんだて
double feature (movie)
ふたつめ
one after next
ふたとおり
pair