Although some of Phnom Penh's main streets have names most just have numbers. The major boulevards run parallel to the banks of the Tonle Sap and the Tonle Bassac Rivers in a north south direction and east west. Bisecting these wide tree lined roads are hundreds of smaller streets. Theoretically even numbered streets run east-west and odd numbers north-south but they sometimes the system dissolves into a more erratic pattern a bit like the traffic that runs along them.
The numbering system for the buildings on any given street is also at best irregular and at worst eccentric. Originally instigated by the French long years of war and reoccupation destroyed the old system. Repopulation was haphazard with many abandoned buildings playing host to squatters for years who just adopted whatever made sense to them or a number they deemed to be lucky. It is not uncommon to see 12Eo 17 22 24A side by side. there can be multiple houses with the same number on the street and not necessarily together or even on the same side. The Eo or E1, like in the photo, stand for 'etage zero' -ground floor and 'etage un' -the first floor.