counter
counter for flags, banners
Specialized counter used for flags, banners, and similar hanging objects. Rare in everyday language; mostly found in historical or ceremonial contexts.
神社には五旒の旗が掲げられていた。
Five banners were displayed at the shrine.
The kanji 旒 is a specialized character for tassels or streamers on flags, extended to a counter for flags. The reading りゅう is the on'yomi.