The mark tells you that the first syllable of the word is stressed.
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In English, there is no standard mark to indicate which syllable of a word is stressed. However, some dictionaries and pronunciation guides may use symbols such as an apostrophe (') or a bold font to indicate the stressed syllable. For example, in the word "example," the stressed syllable is "ex-'am-ple." Note that different variations of English may have different stress patterns, so it is always helpful to consult the specific pronunciation guide or dictionary for accurate stress information.