Note that we already had long threads about the opinions of you and others on this matter; see e.g. Syntax: Escape hatch for unicode haters or Unicode: a bad idea, in general … it’s probably not productive to re-hash it again.
TLDR: Some people like using Unicode identifiers, primarily to make the code closer to mathematical notations in domains where that is very standardized, and others do not. There are various ways to type them, from editor tab completion (\foo<TAB>) to OS shortcuts (e.g. option-x for ≈ on Macs) and language input modes (e.g. switching to Greek input mode) to custom keyboard layouts. For most packages, however, people tend to avoid requiring non-ASCII characters to access an API, either by keeping the external APIs ASCII-only or by providing ASCII equivalents to Unicode APIs (e.g. the way you can use the non-infix xor(a,b) instead of the infix a ⊻ b). Across the Julia ecosystem, you’ll find varying degrees of Unicode usage in code, but it mostly seems concentrated in math-heavy applications.