復古 is read as ふっこ (fukko) and means revival.
ふっこ
fukko
ふっこちょう
revival or reactionary mood
ふっこしんとう
Fukko Shinto
ふっころんしゃ
reactionary
おうせいふっこ
Restoration (England)
ふっこしゅぎ
reactionism
ふっかつ
resurrection
ふっけん
rehabilitation
ふっき
carriage return
また
indirect
ふくしゅう
review (of learned material)
ふくげん
restoration (to the original state or location)
ふくちょう
demodulation