Which version of Crystal are you using? Depending on the Font, the special character of the less than or equal too sign where it is stacked, may be in the extended Unicode part of the character set and Crystal 8.5 is not Unicode compliant, but version 9 and higher are Unicode compliant.
If you are using a version that is Unicode compliant, the following function in a formula will give you the less than or equal to sign that you are wanting using any of the normal fonts (Times New Roman, Tahoma, etc...):
ChrW(8804)
If you are using 8.5, using the following function in a formula using the Symbol font will give you what you are wanting:
Chr(163)
You can always use the Character Map found in the Windows/Accessories folder in the start menu to pick a font and scroll through looking for characters available. If needed you can use the Windows calculator to convert the Hex value that character map gives you to the ASCII decimal value you will need to use in your Crystal Formula for the ChrW(x) or Chr(x) functions.
Hope this helps.