Its the Mi'kmaq flag.
A red cross or crescent on a white background.
The red, white, crescent moon, and star flag is significant as it is the flag of several Muslim-majority countries, symbolizing unity, faith, and national identity.
There might be another answer, but I have a sideways cross necklace and for me it just means the same thing a normal cross means: Jesus's death, burial, and ressurection to save us from the sin we as humans are inherently prone too. The sideways cross necklaces and bracelets you see aren't stating anything different than a cross every has, they are just a fashion statement
The cross has long been a symbol of Christianity: the Crusaders, the Cross of Malta...... Red and white can easily be seen during conflicts, be it on ambulances or a waving flag. It was assumed that,on seeing the red and white symbol, the enemy would realise that the wounded were being evacuated and would not attack them. In Muslim countries a green crescent on a white background is used.
White
sideways
The South Carolina flag features a blue field with a white palmetto tree and a white crescent in the upper corner. The palmetto tree symbolizes the state's resilience and the role it played during the American Revolution, particularly in the defense against British attacks on Sullivan's Island. The crescent is believed to represent a soldier's crescent-shaped gorget, a piece of armor worn during the revolution. Together, these elements reflect South Carolina's history and identity.
lunula
Islamic FlagI think the flag you are looking for is the Singapore flag.
The cross of St. Andrew is commonly known as the Saltire. It is a diagonal cross that symbolizes St. Andrew, the patron saint of Scotland, and is featured prominently on the national flag of Scotland. The Saltire consists of a white cross on a blue background and represents Scotland's heritage and identity.
The Maldivian flag features a green rectangle in the center of a red field, with a white crescent moon facing the hoist side. The red symbolizes the blood of those who fought for independence, while the green represents peace and prosperity. The white crescent moon signifies the Islamic faith, which is central to Maldivian identity. Overall, the flag reflects the nation's cultural heritage and values.
The confederate flag flown in the American Civil War had the same colors as today's flag- red, white, and blue. The flag has a red background with a sideways cross of blue, outlined in white. There are white stars inside the cross representing each of the states that seceded from the union. The red is said to represent the fearlessness of the confederacy itself, the white represents purity, and the "bonnie blue" represents justice and the perseverance of the people of the South.