Perhaps the small document I was given to demonstrate my immunized status would more accurately be called a "kvitl."
The word "kvitl," which may be also spelled kvitel, with it's diminutive form "kvitelach," is discussed at:
https://en.wikipedia.org/wiki/Kvitel
This is a small slip of paper, inscribed with a prayer and often blessed by clergy, that may be carried, left at a grave, or inserted in a gravestone.
My COVID-19 kvitel is a small document stating when and where I received my COVID-19 immunization, and which product was used.
I carry a copy with me at all times!
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