ICAO airport code

What is mysterious LOWW or EDDM? Everyone who interested in aviation know that it's Vienna and Munich airport but only some people know from what it follows. Those codes you can find in NOTAMs, FP (flight plans), sometimes on tickets. The first letter in the code is designation part of the world.

• A = Antarktica & South Pacific
• B = Greenland & Iceland
• C = Canada
• D = North-West Africa
• E = Europe
• F = South & Central Africa
• G = West Africa & Canary Islands
• H = East Africa
• K = USA
• L = South Europe
• M = Central America & Caribbean
• N = South Pacific
• O = Middle East
• P = Hawaii (PH) & Alaska (PA) & North Pacific
• R = East Asia
• S = South America
• T = Caribbean
• U = Russia & countries of the former USSR
• V = South Asia
• W = South-East Asia
• Y = Australia
• Z = China

The second letter is designation of the country. Here I paste image from wikipedia:

And last two letters is designation of the airport.
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Examples:
LOWW - Vienna Schwechat (L=South Europe O=Austria WW=Vienna)
OMDB - Dubai (O=Middle East M=UAE DB=Dubai)