It can possibly refer to the design /art work used in the manuscripts as a colophon.

On Sat, May 6, 2017 at 3:45 AM, Tyler Williams via INDOLOGY <indology@list.indology.info> wrote:
Dear colleagues,

Is anyone aware of a publication that addresses the etymology or use of the term puṣpikā/puṣpakā as a closing formula of a text or manuscript? This meaning is not attested in pre-modern North Indian vernaculars, and appears to enter Hindi in the twentieth century via Sanskrit lexicography (i.e. Syamsundardas, author of the Hindī Śabda Sāgara, appears to have copied his entry for puspikā from Monier-Williams's dictionary). I've checked a few sources on codicology that use the term, but they give no information on the term itself.

With thanks,

Tyler Williams
University of Chicago

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Nagaraj Paturi
 
Hyderabad, Telangana, INDIA.
 
Former Senior Professor of Cultural Studies
 
FLAME School of Communication and FLAME School of  Liberal Education,
 
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