The phrase
"multiple imprints" refers to having more than one distinct impression or influence. It means that there are multiple things or experiences that have left their mark or made an impact on something or someone.
Full definition
Like many other traditional publishers, Amazon Publishing has
multiple imprints under its brand that specialize in different genres and categories of literature.
Admittedly while I do see the appeal of multiple websites
for multiple imprints, I do find the multiple forums a bit of a shame.
Digital Manga has already released several books by both artists across
their multiple imprints.
Under that HCCP group they have
multiple imprints: Zondervan, Zonderkidz, Thomas Nelson, Tommy Nelson (Children's), W Publishing, and Emenate Books (Charismatic).
A single publishing company may have
multiple imprints, often using the different names as brands to market works to various demographic consumer segments (for example, to differentiate between your cookbooks and general fiction novels).