A stamp used to authenticate documents.
Gorkindachina was relieved to find that he was still safe in the possession of his inkan, his seal - an all-important piece of apparatus, this, for one of the peculiarities of Chalakanesia is that they do not use the thumbprint, as in Hell, or the unadorned signature, as in Heaven. From Islam Demaxus to Cherwin Skam, the Chalakanesians refuse to accept an unaccompanied signature as proof of everything, demanding instead that it be counterstamped with one's registered seal, this inkan being in consequence essential for all banking and all legal business.
'That's all right then,' said Gorkindachina, who was starting to get his grip on space and time. 'Three years, you say?' [NoP Ch12]