Type 4
Type 4 could refer to:

 Type 4 asteroid, a type of asteroid
 Type 4 deflector shield, a type of deflector shield
 Type 4 micro-inducer, a tool
 Type 4 phaser emitter, a shuttlecraft-mounted phaser emitter
 Type 4 quantum singularity, a spatial distortion
 Type 4 stealth assault, a method of attack
 Type 4 Tallonian microscanner, a type of microscanner

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 , another series of classifications