According to the manual there are 4 types of ETS tables: set – The table is a set table: one key, one object, no order among objects. This is the default
okular
foreignobject
urn
microsoft-graph-toolkit
mysql-date
django-viewflow
formatting
mutable
bootstrap-datetimepicker
dxf
junit5-extension-model
cyclicbarrier
recode
nested-select
hexavigesimal
prototype-programming
qgraphicsscene
hyperref
squirrel-sql
ansible-awx
ansible-filter
react-table-v6
clisp
decompiling
word-2007
gecko
git-switch
babel-node
catalan
speex