Aura
From MHWiki
Overview
An Aura is a trap bonus that is earned by completing certain tasks within the game. Each Aura is represented by an image in the upper left of the trap image on the Hunter's Camp and Profile pages.
Auras can provide improved trap stats additional effects.
The duration time of the Aura's stacks and the aura's time will be extended each time the aura is awarded until its maximum time, if any, is reached.