A quick note to remind you all how to find the Apple-specific characters on Yosemite.
First, bring up the character viewer by going to System Preferences > Keyboard and ticking “Show Keyboard & Character Viewers in menu bar”, then clicking the new menu bar icon (next to the clock) and “Show Character Viewer”.
Now you want to select “Technical Symbols” in the left-hand pane. If it’s not visible, click the “gear” dropdown above the left-hand pane and “Customize list”:
Tick “Technical Symbols” in the category list and you’ll be good to go.