What does "secretum" mean?

A special seal used for private correspondence.

Secretum

name, noun

name, noun ·Rare ·Advanced level

Noun

1
A special seal used for private correspondence.
"A personal Seal having a secretum is unusual; with armorial and monastic seals they are very common; […]"

Proper Noun

1
A section of the British Museum created in 1865 to store those historical items deemed obscene. historical

"A personal Seal having a secretum is unusual; with armorial and monastic seals they are very common; […]"

From Latin sēcrētum. Doublet of secret.