I would think something like this:

      |
      |  \
      |   \
      |    \  /\
      |     \/  \
      |          \
      |          _\/
      |
      +———————————————

Could (more or less) fit that description and would make more sense as a symbol. Something like it even made it into Unicode (https://emojipedia.org/chart-decreasing/)