I came across a strange symbol while reading the report on the ALGOL 58 programming language (p. 19):
I am referring to the squiggle that appears repeated three times after some semicolons and commas in the above clipping. It somewhat resembles a tilde
~, but it is clearly a distinct symbol, since a normal tilde appears next to the delta.
Was this mark an ad-hoc invention or is it an established symbol? Does it have a recognisable name? What is its Unicode code point, if one exists?
(I don’t think there is a separate site for typography questions, but I did see that questions about typographical marks seem to be accepted here.)