APL function symbol. Unicode Character ⍟ from the Miscellaneous Technical (2300–23FF) block. Its a Transparent SVG pic file, so the symbol can blend in with web page's/printout's background color. Next symbol inside first bracket (⍟) is displayed by using the hex html code &amp;#x235F;. Still, many web browsers are unable to display all or some of the en:unicode characters. This pic can help the users of those web browsers to view these symbols. Pls use it properly. Font used: Code2000. Thanks.
Own work
GJo