# Why ∀ is an invalid character?

**URL:** https://discourse.julialang.org/t/why-is-an-invalid-character/45371
**Category:** Internals & Design
**Created:** [August 22, 2020, 3:17pm UTC](https://discourse.julialang.org/t/why-is-an-invalid-character/45371 "2020-08-22T15:17:18Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![fredrikekre](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fredrikekre/32/1688_2.png) [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [August 22, 2020, 4:35pm UTC](https://discourse.julialang.org/t/why-is-an-invalid-character/45371/5 "2020-08-22T16:35:50Z")

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> [@anon37204545](#):
>
> You can break pretty much anything

Yea but we will not redefine `+` to `-` in Julia base.  
If `∀` was allowed in e.g. variable names, then code like `a∀b = 1` would break if we decide we want to introduce `∀` as an operator.

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