WARNING!

This website contains spoilers for Andy Weir’s Project Hail Mary.
It is recommended you read the book before exploring this site.

#3 λ

The first of six major features of the site has now been launched, the Eridian Number System Converter.

This allows you to convert from decimal to Eridian and vice-versa.

You can paste or type into either the field marked Decimal number or that marked Eridian number and the other field will display the converted number. For Eridian numbers, it’s also possible to use the buttons to key-in each digit.

“ℓ” is clearly their 0. From that, I know that “I” is 1, “V” is 2, “λ” is 3, “+” is 4, and “V” is 5. What about 6 through 9? They don’t exist. After “V” we go back to “ℓ.” Eridians use base six.

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