If you have many letter fonts installed on your PC, you need a program like MainType to work with then and administer them easily. Its intuitive user interface lets you access any of them immediately, and check their typographic characteristics in detail: fonts list, characteristics of each one, detailed view, and examples.
Fonts with the same origen are grouped under the same typographic classification: latin characters, hebrew, cyrillic, mathematic, etc. The interface is very flexible, as it lets you hide and show panels as you wish, and install or uninstall fonts simply.