[zzo38computer]

Other programming languages also have sigils, such as LLVM, etc.

I think that it does not make it less readable.

In some programming languages they will be used to avoid clashes with reserved words, which I think is a good idea.

Some programming languages (such as BASIC) have suffix sigils to indicate data type; some (such as OAA) have both prefix and suffix sigils.

Some programming language may allow multiple sigils together in some cases (e.g. Raku and Free Hero Mesh) (in Raku they called the secondary sigils as "twigils").

The meaning seems to vary depending on programming languages; some are used for similar purposes and sometimes they are used for different purposes.

In Perl, the sigil can indicate scalar vs array (but not numbers vs strings), and in BASIC it can indicate numbers vs strings (but not scalar vs array, which is differently).