No death damage
No death damage is the maximum damage that Link can take without dying even when he would normally not survive[1]. This is used to implement one-hit kill protection.
In Master Mode, no death damage is disabled (when aoc2 flag 0x8 is set)[2].
Calculation
The no death damage value is calculated as follows[3]:
NoDeathDamageBase + floor(PlayerMaxLife × NoDeathDamageAdd) / 4
where NoDeathDamageBase and NoDeathDamageAdd are parameters in Link's bgparamlist. In 1.5.0, those values are 20 (= 5 hearts) and 4 (= 1 heart) respectively.