photon pulse fired from a type 4 phaser
type 4 phaser emitter was a small ship-mounted phaser emitter of a type that could be used on shuttlecraft.
Though phasers were not normally installed on type 6 shuttlecraft they could be fitted for special purposes. The emitters were placed on the forward tips of the two warp nacelles.
2368, the , a shuttle from the Magellan USS , was equipped with type 4 phaser emitters in order to chart the Enterprise-D null space in the J'naii star system with a series of photon pulses. ( : " TNG ")
In the original pencil drawings of the hand-held compression phaser rifle, it was also designated as a type IV phaser.  Startrek.com uses a picture of the type 8 shuttlecraft firing its phasers to depict the type 4 phaser, suggesting its armaments also share this designation. 
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