From the Super Mario Wiki

The title of this article is official, but it comes from a non-English source. If an official name from an English source is found, the article should be moved to its appropriate title.

First appearance Wario Land 3 (2000)

Nobiiru are living thermometers found in Wario Land 3. They sit horizontally within walls with only their eyes visible, and regularly fill with mercury and shoot outwards, extending spikes while doing so. As such, they typically appear in narrow vertical climbing sections. Wario must time his climbing to pass them.

Names in other languages[edit]

Language Name Meaning
Japanese のびーる[1]
From 「のびる」 nobiru, to extend.