It is sometimes assumed that the S-shaped bag delimiters (U+27C5 and U+27C6) are for multisets (because multisets are also called “bags”). However, looking at the attestation shown in N2680, they appear to be used around a well-formed formula rather than for a multiset. This suggests that “bag” simply describes their shape, though the description “The second pair of proposed characters is a set of s-shaped delimiters used as bag delimiters” in the proposal does make it sound as though they were multiset delimiters.
https://www.unicode.org/L2/L2003/03410-n2680-add-math-chars.pdf Given that the referenced document is no longer available, does anyone know what these characters mean?
