Because these protection papers were used to define freemen and citizenship, many black sailors and other men also used them to show that they were freemen if they were stopped by officials or slave catchers. They also called them "free papers" because they certified their non-slave status. Many of the freed blacks used descriptions of tattoos for identification purposes on their freedom papers.
The Japanese word irezumi means "insertion of ink" and can mean tattoos using tebori, the traditional Japanese hand method, a Western-style machine or any method of tattooing using insertion of ink. The most common word used for traditional Japanese tattoo designs is horimono. Japanese may use the word tattoo to mean non-Japanese styles of tattooing.