You want a technical or internal note/post for developers about the com.facebook.katana package (e.g., reverse engineering, app details, or market analysis of Facebook’s Android app).
: A former product manager at Facebook revealed the name was inspired by a dinner at a sushi restaurant named Katana while he was filing a change request.
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The name dates back to the early days of Facebook's mobile development. When the original team was preparing the app for the "Android Market" (the predecessor to Google Play), they couldn't use a simple name like "com.facebook.facebook".