Interest
Proportion of Hacker News items mentioning "citadel" over time.
Mentions
Total number of Hacker News items mentioning "citadel" over time.
A citadel is the most fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of city, meaning "little city", because it is a smaller part of the city of which it is the defensive core. Read more on Wikipedia