International Flags
Here is a colorful brain-teaser for you. Looking at these 15 flags, can you tell what they have in common that flags of no other countries can claim?

Austria

Botswana

Costa Rica

Georgia

Israel

Jamaica

Japan

Laos

Latvia

Libya (pre-2011)

Macedonia

Micronesia

Nigeria

Switzerland

Thailand

Do you give up? If so, scroll down for the answer.

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All of these flags are symmetrical, both vertically and horizontally. That is, they are the same if viewed frontwards, backwards, right side up, or upside down.