Let's break down the filename to understand its components better:
adventerprisek9 : This part seems to indicate that the software is related to "adventure" or more likely, given the context, "enterprise" (possibly a typo in the filename). The k9 might denote a specific type of software or hardware target, possibly related to security or a particular product line. i86bi_linuxl3-adventerprisek9-m2_157_3_may_2018.bin
This filename points to a very specific Cisco IOS image for the platform, commonly used in emulation environments like EVE-NG or GNS3 . Let's break down the filename to understand its