The canonical name for a card from the user's perspective is the name the card was created under. However a card is referenced in the database and in code using the card's "key", which is translated from the name by these steps:

1. decode any HTML
2. add a space before any upper case letter followed by a lower case letter (this splits CamelCase into words)
3. make all upper case into lower case
4. replace any non-alphanumeric character (except *) with a space
5. break the name into words, and make each word singular if it's plural
6. rejoin those words with underscores (instead of spaces)

Some examples:

• Apples — apple
• TedErnst — ted_ernst
• Joe's Blog Entries — joe_s_blog_entry

The key may sometimes be visible to end users in URLs.

Tickets about keys