Installation of the font "Arial Unicode MS"

When in the following table the rows ACTUAL and MUST completely match, the required font is already installed and nothing else is to be done:
 
ACTUAL
∫
∏
≨
≋
⇗
ℋ
ℤ
Φ
MUST

Otherwise install the font Arial Unicode MS, which is shipped with Microsoft® Office (description may depend on operating system and office version):

Terminate all programs.

Go to the Control Panel and double click  the Add/Remove Programs icon.

If you installed your Microsoft Office program as part of an Office package, click Microsoft Office in the Currently installed programs box, and then click Change.

If you installed your Office program individually, click the name of your program in the Currently installed programs box, and then click Change.

In the Microsoft Office 2003 Setup dialog box, click Add or Remove Features, and then click Next.

Select Choose advance customization of applications, and then click Next.

Next to Office Shared Features, click the plus sign (+).

Next to International Support, click the plus sign (+).

Click the icon next to Universal Font, and then select the installation option you want.

If you don't have installed any Office program from Microsoft, you also may license the font from Ascender Corp. (ext. link)