I'm looking for a way to typeset the symbols for outer joins, that is ⟕ U+27D5 onward.
There seems to be nothing in symbols-a4. Note that I'm not looking for ⋊ U+22C9 as this represents a semijoin.
This post presents a custom eps (for only one of the three symbols) and a anonymous comment suggests using an ifsym
timing diagram (I'm awed by the lateral thinking but the result looks ugly).
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