Franking

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

Class

Notion

Domain

Science and technology

In collections

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What Wikipedia says

Franking comprises all devices, markings, or combinations thereof ("franks") applied to mails of any class which qualifies them to be postally serviced.

Excerpt from the Wikipedia article “Franking”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Centpacrr (digital image), Public domain, via Wikimedia Commons.