At this point, she felt safe enough to call him that. She didn't think she could come up with a pet name for Renne as Renne had for her, so she though she'd express her joy with him this way.

"Um, its not a real pole, more like the most bottom or the farthest top of a world. Those places are usually the ones that get the least amount of sun, so its very cold there. That's why its a little easier for me."

She brought him closer to her chest, that way he'd be warmer.