Identifying the Put-Outer

[SnapesSlytherin at aol.com]

No: HPFGUIDX 85707

I don't think this question has been asked of OoP yet, but there's always the possibility it was.  If it had, I'll iron my hands.

<Quote>
OoP, Chapter Three: page 58 (American):
"Got it," he muttered, raising what looked like a silver cigarette lighter into the air and clicking it.

The nearest streetlamp went out with a pop.  He clicked the unlighter again; the next lamp went out.  He kept clicking until every lamp in the square was extinguished and the only light in the square came from curtained windows and the sickle moon overhead.

"Borrowed it from Dumbledore," growled Moody, pocketing the Put-Outer.
</Quote>

My question is this: how did Harry know it was the Put-Outer?  We usually learn about things like that from Harry's POV and nowhere in that area did anyone mention the Put-Outers name.  Are we just supposed to assume Harry just *knew* the name?  

Oryomai
--Who would've posted this sooner, but had a four hour musical workshop this morning (Yeah Kiss Me, Kate!).