Identifying a few mathematical symbols

PCMarine

Diamond Member
Oct 13, 2002
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For my pre-calc class, my teacher gave us a worksheet with a list of mathetical symbols which we need to know. I knew all of them except for a few. I created a pic of them, maybe you can help me identify them.

Pic

I'm pretty sure #1 means "Line Segment," and #4 means "Vector," but I not sure of #2 and #3.