There are five Atype font groups, each determined by specific characteristics:

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1. Biometric: Resembling "biometrics," they draw from biological measurements for identification.

2. Alteration: These fonts maintain a consistent base shape but use additional alterations to create different glyphs.

3. Modular: A broad category, as all Atype fonts are technically modular.

4. Patterned: Glyphs in this group are constructed within a specific pattern by highlighting parts of their design path.

5. Distorted: Similar to "Alteration Fonts," they retain the same base shape but create glyphs by distorting it.