Even the different schematic editors will have some differences in the symbols that they use for the same package sometimes. Can you post the schematic or the symbol? Perhaps recreate the symbol in microsoft paint and post the image.
There are many members here who can steer you in the right direction.
I try to download Rectifier Book from this page,but nothing comes!So I look for it with Google-here is the result www.ieeta.pt/~alex/docs/ApplicationNotes/ Rectifier%20Applications%20Handbook.pdf .By same ONSEMI you can get SWITCHMODE Power Supply Reference Manual at www.onsemi.com/pub/Collateral/SMPSRM-D.PDF
Here you have 22 Interesting and Educating (Theory) Manuals from "ON Semiconductor" (I do not work for "ON Semiconductor" or have any other interest in them, besides knowledge).
Just a few examples (Rewritten File notation):
Power MOSFET's (ON Semiconductor - DL135-D - Rev.8 - Dec-2004) 1126s.pdf
Rectifier Device Data (ON Semiconductor - DL151-D - Rev.5 - Nov-2004) 650s.pdf
Thyristor Device Data (ON Semiconductor - DL137-D - Rev.8 - Nov-2004) 359s.pdf
AC-DC Power Conversion Products (ON Semiconductor - DLD609-D - Rev.1 - Oct-2005) 959s.pdf