Zakef Gadol (Hebrew: זָקֵף גָּדוֹל, with variant English spellings) is a cantillation mark that is commonly found in the Torah and Haftarah.
It is represented by a vertical line on the left and two dots one on top of the other on the right.
[1][dubious – discuss] The Zakef gadol generally functions as a separator between two segments of a verse.
[2] Words that bear the zakef gadol are generally short with no preceding conjunctive.
[3] It is used in situations where a Zakef katon would be expected, but where there is only a single word.