Fans are often used in Nippon by courtiers to hide their faces, and by generals to signal the troops. Eventually it was developed into a weapon as well. The War Fan was primarily developed to be defensive but it can also be used to strike blows with its sharp, metal edges.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A War Fan may be used in two ways: it can either be used as an additional hand weapon with the Jidaimono style or as a buckler in close combat with the Sewamono style.