Highlighter pink
Any national flag is a symbol of national sovereignty
Prior to the Arab Spring War in 2011, the national flag of Libya used to have only one color; green. More specifically, it consisted of a simple green field with no other characteristics. Also, many signal flags are just one color. Then, of course, the flag of surrender is but one color; white. Currently, there is no national flag with only one color.
Images of the Swiss flag can easily be found on-line by navigating to any vexillology sites, most of which will have images of all national flags. One example would be vexillology matters.
no, unless you count the peace flag. but that is not a national flag so the answer is no
Same as for any other flag - to serve as a national symbol.
Inverting any national flag is a signal of distress.
The color brown is not commonly used in flags. When it is used, it may represent the Earth, soil, or unity with nature. The shade of brown and the specific context in which it is used in a flag can influence its meaning.
any day
any day
In North America any person may fly the National flag on any building he or she wishes. Other Counties and regions may be different.
Any foreign national flag may be the same height as the USA flag, if the US flag is to the observer's left.
Only one of the current national flags has the color "purple" : the flag of Dominica includes a Sisserou Parrot, which should be depicted as green and purple. (Some renditions use a paler color that has more blue.)Other flags that prominently include actual "purple" or "lilac" :Flag of the republic of Chuvashia in the Russia FederationFlag of the Balearic Islands (Spain)Flag of Málaga (city in Andalusia, Spain)Flag of MontrealOther Similar ColorsThe center of the Brazilian flag is "night blue" and often seen as purple, and the flag of Qatar is maroon.