Is there a legend of what the symbols on the top left of the ticket signify?

[Jeremy Barrass]

This question is in reference to Atlassian Documentation: Searching for issues and filtering

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[TõnisO]

If you mean what I think you mean then they are just small visual indicators for each Issue Type. You can find out what each means by hovering on it.

A full list is available in Administration -> Issues -> Issue Types (https://{host}.atlassian.net/secure/admin/ViewIssueTypes.jspa).