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The Symbol lets you "place a [...] card into your hand" without specifying "from your discard pile".
Now, one could assume a ground rule that burial pile cannot be accessed unless explicitly stated. But. I can't find such a ground rule, and other similar effects on new cards still do specify "from discard", so we cannot even infer it.
So, can Sigraed use this to pull cards from burial?
(Would certainly explain the unusually high focus cost of the effect)