Cobra mine and Cobra mine BPO.
Mines were a legitimate weapon when EVE launched, but their functionality was removed very soon (2004?) due to mine fields causing extensive lag.
The Cobra mine and the bpo are very rare compared to Anaconda and Python (why so rare?).
In 2012, mines and their bpos were among a number of relic items that were accidentally deleted from the game, but were later restored.