What is the meaning of Haak?

hook

bracket (for enclosing text or mathematical symbols)

inflection of haken:

  1. first-person singular present indicative
  2. (in case of inversion) second-person singular present indicative
  3. imperative

first-person singular present indicative

(in case of inversion) second-person singular present indicative

imperative

hook (usually as part of a closure, etc.)

detour (deviation from moving in a straight direction)

Source: wiktionary.org