Pound-Star Notation is an in-progress notation by SuperJedi224. The latest revision of the notation, Multi-Nested Hyper-Exploding Pound-Star (H#*<<>>), is defined as follows: An expression consists of one or more entries separated by groups consisting of one or more items, each of which may be either a star character (*), a carat (^), an explodon array, denoted as a colon-separated list of nonnegative integers, of which at least one must be positive, wrapped in curly brackets; an at sign (@), a nested group (denoted as any valid separator group- even one containing other nesting groups or supernests- wrapped in angle brackets), or a supernest, denoted as either a nonnegative integer or any valid separator group in square brackets or an empty pair of square brackets. The first entry must be