In the beginning, Indians wrote 7 more or less in one stroke as a curve that looks like an uppercase ⟨J⟩ vertically inverted. (seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube.
The seven Classical planets resulted in seven being the number of days in a week.[citation needed] It is often considered lucky in Western culture and is often seen as highly symbolic. Unlike Western culture, in Vietnamese culture, the number seven is sometimes considered unlucky.[citation needed]
It is the first number whose pronunciation contains more than one syllable, not counting 0.