Mnemonics

"tack"

• is just a quote in perl6
• can be used to "tack" things onto perl6

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Used as a brace pair or quote pair

` has no special meaning and is just a quoting character

Other uses

` is more or less reserved for use by user's private code through overloading/grammar warping

Old, deprecated, or other language uses

` was used to "shell out" in perl5, very tackily. Perl6 does away with that practice.