The number 7. It comes after six and before eight.

Ordinal: seventh. Common collocations: seven days a week, seventh heaven (extreme happiness), seven deadly sins. Note: -teen suffix for 17 (seventeen), -ty suffix for 70 (seventy).

Seven is considered a lucky number in many Western cultures. There are seven days in a week, seven notes in a musical scale, and seven colours in a rainbow. 'Seventh heaven' means a state of extreme happiness. James Bond's code is 007 — said as 'double-oh-seven'.