Every crew member gets a name tag attached to their spacesuits during missions into hostile terrains. This is for the purpose of identification in the event of low-visibility or fatalities. Being the chief science officer, Spock very often partakes in such trips, so much so that he has his own helmet on which the label is routinely changed so that it will not wear out with use. In an unfortunate turn of events, a label was once misprinted resulting in Spock being labeled as “Spack.” This began a long sequence of purposefully misspelled nametags such as Spook, Spork, Slick and Shrek. The crew thought it was hilarious. Spock did not.