National flag in the context of "Flag of Switzerland"

Ottomanism or Osmanlılık (Ottoman Turkish: عثمانلولق, Turkish: Osmanlıcılık. French: Ottomanisme) was a concept which developed prior to the 1876–1878 First Constitutional Era of the Ottoman Empire. Its proponents believed that it could create the Unity of the Peoples, İttihad-ı Anasır, needed to keep religion-based millets from tearing the empire apart.
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A national symbol is a manifestation of a nation or community, serving as a representation of their identity and values. National symbols may be not only applied to sovereign states but also nations and countries in a state of colonial or other forms of dependence, federal integration, or even ethnocultural communities that identify as a "nationality" despite lacking autonomy.

National symbols intend to unite individuals by creating visual, verbal, or iconic representations of the national people, values, goals, culture and/or history. These symbols are often rallied around as part of celebrations of patriotism and/or aspiring nationalism (such as independence, autonomy, and/or separation movements) and are designed to be inclusive and representative of all the people of the national community.

The national flag of Vietnam, formally the National flag of the Socialist Republic of Vietnam (Vietnamese: Quốc kỳ nước Cộng hoà xã hội chủ nghĩa Việt Nam), locally recognized as the golden-starred red banner (cờ đỏ sao vàng) or the Fatherland flag (cờ Tổ quốc), was designed in 1940 and used during a failed communist uprising against the French colonialists in Cochinchina that year. The red background symbolizes revolution and bloodshed. The golden star symbolizes the soul of the nation and the five points of the star represents the five main classes in Vietnamese society—intellectuals, farmers, workers, entrepreneurs, and soldiers.

The initial incarnation of the flag was used by the Viet Minh, a communist-led organization created in 1941 to oppose Japanese military occupation and French colonialism. At the end of World War II, Viet Minh leader Ho Chi Minh proclaimed Vietnam independent and signed a decree on 5 September 1945 adopting the Viet Minh flag as the flag of the Democratic Republic of Vietnam. The DRV became the government of North Vietnam in 1954 following the Geneva Accords. The flag was modified on 30 November 1955 to make the points of the star straighter, which became the standard design for the current Vietnamese flag. Until the end of the Vietnam War in 1975, the State of Vietnam and later the Republic of Vietnam (South) used a yellow flag with three red stripes. The red flag of North Vietnam was later adopted as the flag of the unified Vietnam in 1976. The flag of Vietnam is the only flag amongst ASEAN that does not contain the colour white, with red and yellow/gold being its historical national colours.

The national flag of Turkey, officially the Turkish flag (Turkish: Türk bayrağı), is a red flag featuring a white crescent and star on its emblem, based on the 18th-century flag of the Ottoman Empire. The flag is often called "the red flag" (al bayrak), and is referred to as "the red banner" (al sancak) in the Turkish national anthem. The measures, geometric proportions, and exact tone of red of the flag of Turkey were legally standardized with the Turkish Flag Law on 29 May 1936.

The national flag of Greece, popularly referred to as the Blue-and-White (Γαλανόλευκη, Galanólefki) or the Cyan-and-White (Κυανόλευκη, Kyanólefki), is officially recognised by Greece as one of its national symbols and has 5 equal horizontal stripes of blue alternating with white. There is a blue canton in the upper hoist-side corner bearing a white cross; the cross symbolises Eastern Orthodox Christianity. The blazon of the flag is azure, four bars argent; on a canton of the field a Greek cross throughout of the second. The shade of blue used in the flag has varied throughout its history, from light blue to dark blue, the latter being increasingly used since the late 1960s. It was officially adopted by the First National Assembly at Epidaurus on 13 January 1822.

While the nine stripes do not have any official meaning, the most popular interpretation says that they represent the syllables of the phrase Ελευθερία ή Θάνατος (Freedom or Death): the five blue stripes for the syllables in Ελευθερία, the four white for those of ή Θάνατος. White and blue symbolize the colours of the Greek sky and sea.

The national flag of Saudi Arabia is a green background with Arabic inscription and a sword in white. The inscription is the Islamic creed, or shahada: "There is no deity but God; Muhammad is the Messenger of God". The current design has been used by the government of Saudi Arabia since 15 March 1973.

The national flag of Iran, also known as the Tricolour Flag of Iran (Persian: پرچم سه‌رنگ ایران), is a tricolour featuring the Pan-Iranian colours comprising equal horizontal bands of green, white and red with the national emblem (Allah) in red centred on the white band and the takbir written 11 times each in the Kufic script in white, at the bottom of the green and the top of the red band.

Originally adopted on 7 October 1907 with the lion and sun emblem in the center, the current flag was adopted on 29 July 1980 following the Iranian Revolution of 1979.

The Union Jack or Union Flag is the national flag of the United Kingdom.

The flag consists of the red cross of Saint George (the patron saint of England), edged in white, superimposed on the red saltire of Saint Patrick (the patron saint of Ireland), also edged in white, superimposed on the saltire of Saint Andrew (the patron saint of Scotland). Wales is not represented in the flag by Wales's patron saint, Saint David, because the flag was designed while Wales was part of the Kingdom of England.

The national flag of Romania (Romanian: drapelul național al României) is a tricolour featuring three equal vertical bands colored blue (at the flagpole), yellow and red, with a width to length ratio of 2:3.

The current version was adopted in 1989 in the wake of the Romanian Revolution and is defined in the Constitution of Romania as well as by organic law 75/1994, plus several later clarifications. Starting in 2023, the law provides exact color shades for print and digital purposes.