The Order of the Brass Octopus, sometimes shorted to just "OBO", is an order of scientists, many of whom are known for their eccentricities. Their symbol is the octopus, which some members have tattooed on their bodies or worked into their shop decor in some manner.
The Hypocras Club was associated with the Order, but was more militant in its exploration of supernatural creatures, which it saw as threats to humanity. After the Hypocras Club is discovered by Alexia and disbanded, its members are reabsorbed into the OBO.
The local London chapter of the OBO is located at Number 88 in Lord Akeldama's neighborhood.