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Why are variables in Erlang capitalized to start with?

I am new to Erlang and just wondering why variables are designed to start with a capital letter that is so different from the one in other languages?

Perhaps because it is immutable?

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2 answers

Earlier versions of Erlang were implemented in Prolog, and just like Prolog, Erlang variables start with either a capital letter or underscore.

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In addition to what @SteveVinoski said,

Starting with a capital letter, it separates variables from atoms, which are often used in the Erlang code. Atoms always begin with a lowercase letter. The name of the modules and functions are atoms.

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Source: https://habr.com/ru/post/981984/

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