日光 にっこう反射 はんしゃ信号 しんごうでしょう
nikkōhanshashingōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 日光反射信号

1. Probably a sunlight reflection.; Possibly a sunlight reflection.

Polite
Presumptive
Conjecture