專利提到的reference numeral是啥意思?

The features shown in the figures may be labeled with words, although to facilitate preparation of a regular patent application, the team may wish to use "reference numerals" on the figures right from the... show more The features shown in the figures may be labeled with words, although to facilitate preparation of a regular patent application, the team may wish to use "reference numerals" on the figures right from the beginning.

我看了一下關於專利網站,這個字一直出現。
例如:http://www.cleanairdevice.com/description_of_preferred_embodim.htm
我也有大概的想法,不過希望看到有人幫我確認!

所以我的問題是:reference numeral要怎麼翻譯成中文?

不要從線上字典分開翻譯兩個字後告訴我,謝謝!
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