Seven

Numeral

• Hindu-Arabic numeral : 7
• Roman numeral : VII

Factors of Enlightenment

• Mindfulness
• Investigation of dhammas
• Effort (or energy)
• Zest
• Tranquility
• Concentration
• Equanimity

Days of week

• Sunday
• Monday
• Tuesday
• Wednesday
• Thursday
• Friday
• Saturday

Astronauts for Mercury Project

• Alan Shepard
• Virgil “Gus” Grissom
• John Glen
• Walter Schirra
• Scott Carpenter
• Gordon Cooper
• Deke Slayton

Colors of the rainbow

• Red
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet

Miscellaneous

• Heptagon
  seven sided polygon
• September
  7th month of the old Roman Calendar
• July
  7th month of the Gregorian Calendar