multidimensional hash emulation: a very old way creating multidimensional hash. With a hash emulator, a list of keys (rather than just one) is provided in a hash assignment. The keys are then joined with the contents of $; (chr(28) by default) and used as a single key.
Example: $people{ $state, $county } = $census_results
Score: 2 points if you knew they existed OR 3 points if you knew the syntax and how the keys are joined

zero-width assertion: this term is used to describe metacharacters (e.g. ^ and $) and metasymbols (e.g. \b and \B) in regular expressions that represent locations, not characters, within a pattern. In other words, zero-width assertions are zero characters wide.
Score: 2 points

rvalue: an rvalue is what goes on the right side of an assignment operator. There is also an lvalue that goes on the left side of the assignment operator. In the assignment: $x = $y; $y is the rvalue.
Score: 1 point

variable interpolation: the process of evaluating a variable within an expression.
Example: $foo = "bar"; $x = "$foo"; $x now equals "bar" because $foo was interpolated inside the quotes.
Score: 1 point

compound statement: A combination of expressions and blocks where the blocks are exectuted only if the condition of the expression is met.
Example: if (EXPR) BLOCK; unless (EXPR) BLOCK;
Score : 2 points

grave accent: another name for the "backtick" character ('`')
Score : 2 points

range operator: the operator represented by either two or three dots in a row: (..) or (...). See perlop for examples.
Score : 2 points if you knew what it was OR 3 points if you knew it could take 2 or 3 dots.

weak reference: an experimental feature of Perl that does not increase the reference count of an object
Score : 2 points if you heard of it OR 3 points if you knew about the reference count bit.

funny character: Yup, this is a computer science term as coined by Larry Wall in the Camel book. The funny characters are simply the $, @, %, &, and * symbols that precede a symbol table entry. ($foo, @foo, etc.)
Score: 2 points