いろんなフォントで「letter_security」変換
Zen Old Mincholetter_security
Yusei Magicletter_security
M PLUS 1letter_security
Shippori Antiqueletter_security
Yuji Mailetter_security
Dela Gothic Oneletter_security
DotGothic16letter_security
Train Oneletter_security
Hira Mincholetter_security
Potta Oneletter_security
Reggae Oneletter_security
Stickletter_security
Zen Kurenaidoletter_security
Kosugi Maruletter_security
Rampart Oneletter_security
Hachi Maru Popletter_security
New Tegominletter_security
RocknRoll Oneletter_security
Kaisei Decolletter_security
「letter_security」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
