http://www.wfublog.com/2015/06/unicode-special-character-display-on-webpage.html
「Open Font Library」開放字型資料庫 https://fontlibrary.org/
Character Encodings - Fonts - Segoe UI Symbol http://www.kreativekorp.com/charset/font.php?font=Segoe+UI+Symbol
http://www.wfublog.com/2015/06/icon-font-unicode-special-character.html