 
(URL to the results below) Glyph Entry Key: "Toplevel" is the first Hex digit of the desired chunk. "Nextlevel" is the second Hex digit. "Lastlevel" is the third. Put "00" after that and you have the starting point in Hex; e.g.: 1C800 through 1C8FF if Top, Next, and Last are 1, C, and 8. Characters in RED have been combined with another character because they're combining forms. 
Unicode Hex UTF8 Hex ShiftJIS Hex Decimal Code X 
Toplevel: 
 

Nextlevel: 
 
Lastlevel: 
 
Block Nav: 

⩁  Union With Minus Sign 
Unicode (Hex): 02A41  
UTF8 (Hex): E2A981  
ShiftJIS (Hex): None  
Unicode (HTML): ⩁ 
Supplemental Mathematical Operators (0x02A000x02AFF) 
(c)2005, Brett Baugh  but it's open source. (Brief Description  Source Code Distribution)