UNO written in capitals is a short way of writing the United Nations Organization — the full, formal name of the group most people simply call the UN. You will meet it in older textbooks, in exam papers, and in Indian and some European English, where UNO is still normal. In American and British news today it is nearly always just 'the UN', so if you write UNO in an essay it will not be wrong, but it will sound a little old-fashioned or textbookish.

UNO written in capitals大寫寫成UNO is a short way of writing the United Nations Organization是United Nations Organization（聯合國組織）的簡寫——the full, formal name of the group most people simply call the UN這是大家平常直接叫做the UN那個組織的正式全名。You will meet it in older textbooks, in exam papers, and in Indian and some European English你會在比較舊的教科書、考卷，還有印度和一些歐洲英語裡看到它，where UNO is still normal在那些地方UNO還是很常見的說法。In American and British news today今天美國和英國的新聞裡 it is nearly always just 'the UN'幾乎都只說'the UN'，so if you write UNO in an essay所以如果你在作文裡寫UNO it will not be wrong並不算錯，but it will sound a little old-fashioned or textbookish但聽起來會有點老派、有教科書味。

Say the letters one by one: U-N-O.

Say the letters one by one要一個字母一個字母唸：U-N-O就是U-N-O。

Do not confuse it with the card game spelled the same way — that one is a Spanish word meaning 'one', said 'OO-noh', and it is completely unrelated even though the letters match. Which one is meant is always obvious from what is around it.

Do not confuse it with the card game spelled the same way不要把它跟拼法一樣的那個紙牌遊戲搞混——that one is a Spanish word meaning 'one'那個字是西班牙文，意思是「一」，said 'OO-noh'唸作'OO-noh'，and it is completely unrelated even though the letters match雖然拼法一樣，但完全沒有關係。Which one is meant is always obvious from what is around it到底是指哪一個，從前後文一看就知道。