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信呼吸 Noblesse

Yes, it is also a pun on "no breath", considering "breath" was Tiger's thing from SEVENS.

Noblesse is from noblesse oblige, the idea that those who are privileged should be generous, noble, and responsible to those who are less privileged. That nobility is not merely gained through blood, but social status and good acts.

Taken apart, the kanji mean individual things that are part of what a "Noblesse" is in canon.

信 can mean trust, sincerity, honesty, and (religious) devotion. 呼 can mean to call out or cry out. 吸 can mean to inhale, or (magnetic) attraction.

呼吸 together means breath. It can also mean harmony and peace, relating to how the voice of a Noblesse can settle disputes.

Anyway, the kanji is not how any of those kanji are individually read no matter how you slice it. This is what's known as a "forced reading" - they slap kanji together that look cool, but force a completely different reading in the furigana to name it something else.