Lifeline - one same name and two different purposes.

So why is both LIfeline different but same unique name?

http://leagueoflegends.wikia.com/wiki/Named_item_effect#Lifeline

Lifeline grants you a type of shield upon taking damage that would decrease you below a threshold.

The following items grant Lifeline:

Hexdrinker: Passive: UNIQUE – LIFELINE: If you would take magic damage that would reduce maximum health below 30%, you first gain a shield that absorbs 110 - 280 (based on level) magic damage for 5 seconds (90 second cooldown).

Maw of Malmortius: Passive: UNIQUE – LIFELINE: If you would take magic damage that would reduce maximum health below 30%, you first gain a shield that absorbs 300 (+ 100% bonus magic resistance) magic damage for 5 seconds as well as LIFEGRIP.

UNIQUE – LIFEGRIP: Grants +20 attack damage, +10% spell vamp and +10% life steal until out-of-combat.

Sterak's Gage: Passive: UNIQUE – LIFELINE: Grants STERAK'S FURY upon taking 400 - 1800 (based on level) damage within 5 seconds (60 second cooldown).

UNIQUE – STERAK'S FURY: For 8 seconds grants increased size, +30% Tenacity, and a shield that starts decaying after 0.75 seconds based of 75% bonus health.