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Þ - Sport climb
↓ - Lower-off (chain or ring bolts)
X - Danger! Danger Will Robinson! Bad bolts, loose rock, dodgy pro!
BR - Bolt Runner (usually a carrot bolt requiring your own bolt hanger)
FH - Fixed Hanger
RB - Ring Bolt
BB - Bolt Belay (usually a carrot bolt)
DBB - Double Bolt Belay (usually carrot bolts)
FA - First Ascent
FRA - First Recorded Ascent (may have been done before)
TR - Top Rope ascent
Alt - Alternate leads