If i don't know a few sigils it looks like line noise... Let's make a PL without sigils... Now... What is the 'foo' that i'm reading? is it an $scalar? an @a

If i don't know a few sigils it looks like line noise... Let's make a PL without sigils... Now... What is the 'foo' that i'm reading? is it an $scalar? an @array? is it a %dict? a reference? an object? a función? a keyword?