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Some of these are more grounded in folk wisdom than others — say, zodiac sign versus Myers-Briggs type — while others are purported to based in psychology, such as enneagram type or love language.

Millennials and Gen Z tend to be enthralled with frameworks that purport to tell them more about who they are, whether it’s Myers-Briggs, enneagrams or tarot.

Judging from the popularity of personality tests such as the enneagram or the Myers-Briggs test, and of genetic testing companies such as 23andMe, it seems like people are searching for their "authentic selves."

Each sandwich was numbered, so people simply responded with their number like it was some kind of bread-wrapped enneagram test.

Just recently, one human resources director ran a workshop for Arnold’s team on a personality test called the enneagram, and Arnold learned that she’s a “number six.”