What kind of transistor is the one similar to an integral sign
The circuit utilizes Schottky transistors as opposed to normal BJTs. Note that the title of the diagram is "LS04" where LS = low-power-schottky. From the wiki page quoted, a Schottky transistor is like this: -




  Effective internal circuit composed of Schottky diode and bipolar
  junction transistor.


Another quote: -


  A Schottky transistor is a combination of a transistor and a Schottky
  diode that prevents the transistor from saturating by diverting the
  excessive input current. It is also called a Schottky-clamped
  transistor.