Unicode Character from the Miscellaneous Technical (2300–23FF) block. Its a Transparent GIF 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;#x2301;. Still, many web browsers are unable to display all or some of the unicode characters.
w:File:U+2301.gif
Beao