Three rows in a right angle header!? Yes! These chunks of 0.1" header has yet-another-row - handy for when you want to connect cables that come in sets of three, like perhaps sensors, or servos. These plug into any standard 0.1" spacing perf-boards or other PCBs and work nicely with Adafruit's female-ended wire sets.
Comes in a set of four pieces, each piece is 3 rows by 4 rows. You can stack these next to each other in any direction. Adafruit think these are a great addition to Adafruit's 16-channel PWM/Servo driver breakout, so they have a photo showing them installed above.