This kana is formed by adding dakuten (voicing marks) to the base kana 『そ』 (so), changing its pronunciation to 『ぞ』 (zo). It is used in vocabulary and can also function as a sentence-ending particle to add emphasis or assertiveness, often in informal or masculine speech. For example: 『それは ほんとうだぞ』 (sore wa hontō da zo, 'That is true, I tell you!').