For some reason, every time I sit down with an Entity Relationship Diagram, the first thing I have to do is try to remember what the relationship symbols mean. Doesn't matter if I cranked out 5 ERDs last week. The meanings of the various chicken-scratches...err, crow's feet...just never stick in my brain.
To help myself out, I've created this single page, printable PDF and tacked to my bulletin board. Nice to know it's there waiting to help the next time I forget this stuff.
Download the PDF here: ERD Relationship Symbols Quick Reference.pdf