SEK is the official currency code for the Swedish Krona. When referring to currencies, there are often multiple ways to describe them, such as nicknames or slang terms. Some common synonyms for SEK include "crown" or "krona" in English, as well as the Swedish term "kronor." Additionally, the symbol for SEK is similar to that of the Japanese yen (¥), so it may be referred to as the "Swedish yen" in some contexts. Another possible synonym could be "Swedish currency." Despite its various synonyms, SEK remains the official currency of Sweden and is widely recognized in international trade and commerce.