a flag
... that a flag was used to facilitate trade between Momoyama Japan and Ming China?
... that <b id="mwA6A"><a href="./Japan–Ming_trade-ship_flag" id="mwA6E" rel="mw:WikiLink" title="Japan–Ming trade-ship flag">a flag</a></b> was used to facilitate trade between <a href="./Azuchi–Momoyama_period" id="mwA6I" rel="mw:WikiLink" title="Azuchi–Momoyama period">Momoyama</a> Japan and <a href="./Ming_dynasty" id="mwA6M" rel="mw:WikiLink" title="Ming dynasty">Ming</a> China?