Numbered Tag, Numbered Ticket
noun
You know 番号 means "number" so add a tag to it and you have a numbered tag.
ばんごうふだ
This is a jukugo word (番号) with a single-word kanji added. That means you have two on'yomi readings from the jukugo word and the kun'yomi reading from the single kanji (ふだ). Put them all together and you have the reading of this kanji!
番号札をとって、お待ちください。
Please take a numbered ticket and wait your turn.
すみません、この辺りに番号札はありませんでしたか？
Sorry, wasn't there a numbered ticket around here?
スーツケースの番号札を失ってしまった。
I lost the numbered ticket for my suitcase.
かき氷屋さんで番号札をもらって、待っている間にお茶でもしましょう。
Let's get a numbered ticket at the shaved ice shop, then go grab some tea while waiting.