The logo is made up of two parts - the lamb and the hebrew letter "tav".
A lamb is known to be a gentle, patient and kind animal - It does not envy, does not boast. It is not proud and does not dishonour others. It is not self-seeking, not easily angered and keeps no records of wrongdoing. It rejoices with the truth, and is always protecting, trusting, hoping and persevering.
Tav is the twenty-second letter of the hebrew alphabet, which means to seal and to cut a covenant.