いろんなフォントで「set square」変換
Zen Old Minchoset square
Yusei Magicset square
M PLUS 1set square
Shippori Antiqueset square
Yuji Maiset square
Dela Gothic Oneset square
DotGothic16set square
Train Oneset square
Hira Minchoset square
Potta Oneset square
Reggae Oneset square
Stickset square
Zen Kurenaidoset square
Kosugi Maruset square
Rampart Oneset square
Hachi Maru Popset square
New Tegominset square
RocknRoll Oneset square
Kaisei Decolset square
「set square」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
