'Head' in the Bible

So Paul, [after] remaining many days longer, said farewell to the brothers [and] sailed away to Syria, and with him Priscilla and Aquila. He shaved [his] head at Cenchrea, because he had [taken] a vow.

And [when] the ship was caught and [was] not able to head into the wind, we gave way [and] were driven [along].

Therefore I urge you to take [some] food, for this is necessary for your preservation. For not a hair from your head will be lost."