In MySQL Workbench table editor there are 7 column flags available: PK, NN, UQ, BIN, UN, ZF, AI.
PK obviously stands for Primary Key. What about others?
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This exact question is answered on mySql workbench-faq:
Hover over an acronym to view a description, and see the Section 8.1.11.2, “The Columns Tab” and MySQL CREATE TABLE documentation for additional details.
That means hover over an acronym in the mySql Workbench table editor.
Here is the source of these column flags
http://dev.mysql.com/doc/workbench/en/wb-table-editor-columns-tab.html
Source: Stackoverflow.com